Probability - Everything You Need to Know. 11 New Tricks and Shortcuts, GRE, GMAT and more

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That’s right, everything you need to know for probability. And versus Or, with replacement and without, specific orders, simplifying probabilities, ratios and probability, probability formula, ‘at least’ in probability, probability and combinations, using venn diagrams for probability, independent probabilities, repeating probabilities until event occurs, letter arrangement probability. If you don’t learn something, I’ll eat my hat.
And it’s not just for GRE and GMAT students wanting probability questions and difficult probability examples, it’s for any student wanting an introduction to probability.
I offer private GRE / GMAT tutoring online at a fixed rate of $140/hr. Please get in touch via the email below, or through my tutoring website: www.gretutorlondon.com/
Enquiries: philip@gretutorlondon.com
The GRE and GMAT are two of most used graduate exams for those seeking to study a Masters Degree or Masters in Business Administration (MBA) degree. The Graduate Record Exam and Graduate Management Admissions Test have been taken for over 50 years and are taken by approximately 600,000 and 300,000 people worldwide annually, respectively. These exams are typically taken between the ages of 18-40, by those who have completed, or are about to complete, their Bachelors Degree.
Business Enquiries: philip@gretutorlondon.com
Grateful for any support: / testedtutor If you’re now ready to get into your dream MBA program, my former student, Angel, is offering virtual private Admissions coaching. She was admitted into Harvard Business School, The Wharton School of Business, and Columbia Business School (accepted into every school she interviewed for) after graduating from UCLA with a degree in Communication. She also got 3 perfect scores on the GRE’s Analytical Writing Assessment (99th percentile).
Here is her link - linktr.ee/angel_accel - and you can reach her at angellinzhu@gmail.com with the subject line, “PHILIP SENT ME.”

Опубликовано:

18 авг 2022

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Комментарии : 187

@RyuStardust Год назад

HI Philip! I gave my GRE today after binging your videos the past week. I had gotten a 313 (160Q, 153V) in my first attempt and got a score of 326 (170Q, 156V) today! I can't thank you enough for theses amazing videos. Those little quant tricks on mixtures, weighted averages, ratios, and probabilities helped me save so much time in my quant section today which certainly boosted my score by a lot. Thanks again for putting up so much free content for everyone to see, this definitely did the trick for me.

@TheTestedTutor Год назад

Wow, a perfect Quant score! Great job Sparsh and thank you for the kind words.

@tejal8382 Год назад

How many mocks you gave ?

@bashu70 Год назад

Hi ..sparsh..I am planning to give GRE in Nov..pls guide me how to start from

@ashleeT Год назад

@SparshJain how did you prepare for quants and verbal?

@karishaananyaneelakandan413 Год назад

How to score 150 plus in verbal

@Motorcyclegymnast Год назад

Hi Philip I just wanted to say you are the definition of work smarter not harder…I spent countless hours trying to memorize all this crap and learned way more in your videos. Your teaching style makes it easy to follow along! Thank you so much

@TheTestedTutor Год назад

At minute 38:15 the answer choices should read 0.10, 0.12, 0.18, 0.28 and 0.30. Well spotted ctlr9k!

@rajasekhar6058 Год назад

Hey philip! I gave my GRE Today after going through your videos. I secured 312 (161 q, 151 verbal). My score increased from 290 to 312. Thank you for your service for community.

@TheTestedTutor Год назад

Well done Raja!

@himanshnama7365 Год назад

hey raj, hw long it took u to increase 22pts

@ghadahahmed3471 Год назад

Hello philip, I am coming to express my gratitude 🙏🏻 for all your videos especially the 5 weeks quant section, throughout the past 3 weeks I have been watching most of your videos, and I re-entered the gre general exam and my grade have raised for 10 points . Thank you so much for your great efforts (from Egypt 🇪🇬)

@prabhudattamishra7245 Год назад

Hey Philip! I was kind of waiting for this day when I could write a message to thank you. I gave my gre today and scored 321. I can't thank you enough!! You are the best teacher one could ask for😋😋

@NC-vk6xe 2 месяца назад

Hi Philip, I just wanted to say thank you!! Your videos are amazing and perfect to catch up on a lot of topics all at once. I got a 325. I couldn't repay you in any way, so I helped someone else who was taking the test and prayed for you. Just wanted to let you know that I'm so grateful for your work! Thanks again.

@stevensosa5995 Год назад

This just makes so much sense when you explain it. Thank you so much for your help! I struggled with the probability questions on my practice exams and in the actual GRE, but you make to so simple.

@aceallen2505 Год назад

I recently took GRE and scored 314 (156V, 158Q, 4.5 AWA) in my first attempt. Though this is not as high score as 340, I am content as it would land me in a coveted University. I would thank Test Tutor for all the insights. Hope you make more such videos with these little but highly lucrative tricks. You are a constant impetus, and it is always quelling to watch you videos- keep up the good work 🙌

@TheTestedTutor Год назад

Thanks so much Ace

@oneepicsaxguy6067 Год назад

A very nice video! Knowing combinatorics really helps with probability, but your video showed an alternative way for all these problems which now makes it easy for me to cross check!

@osaidqasim5103 Год назад

Thank you so much for this amazing and smooth teaching, I’m so lucky that I’ve found this video.

@tarunraghu1 Год назад

Happy Teacher's Day Philip !!!! . Your videos have helped me immensely in my preparation. Hoping to get a good score. You are venerated by all of us. God Bless

@avinashks3258 Год назад

Hello Philip, what was the final option for the independent event question? 0.3--0.12 = 0.18 doesn't equate to any of the fraction in the answer choice.

@applepeel1662 10 месяцев назад

exactlyyy

@halizawil 10 месяцев назад

I was thinking the same thing! Couldn’t find the answer online.

@hogrideeeeer 5 месяцев назад

⁠@@halizawilthe answer is 0.18

@mimkhandaker5082 Год назад

Thankyou for making these videos. I’m taking my GRE in about 2 weeks and I’m binge watching all your videos. Great help!

@dominicmutiso1502 8 месяцев назад

how did it go?

@oneepicsaxguy6067 Год назад

Hey, I gave my GRE exam today and scored 327 (V 159,Q 168). Although I have a maths background, your math videos really helped me brush up my topics and learn a few tricks too (weighted average trick is golden). Thanks for the help!

@TheTestedTutor Год назад

Well dobe my man!

@swoooshfloop Год назад

So helpful - thank you so much. Been binging your videos!

@ayushsrivastava9997 Год назад

Man this video is probably the best of your videos I scored 161 from the previous 151 Thanks a lot mate 😊

@ktheman1 Год назад

hey mann youre a real g fam i have my GRE tmr imma ace it cuz of your help (hopefully!)

@TanishqaSawant Месяц назад

This video is amazing! Probability was always my weakness, and this video cleared a lot of the concepts. Thanks a lot!

@uchihaichizoku Год назад

Very nice video Philip! Thanks a lot!

@tejal8382 Год назад

You are the best ! The way you explain even the most complex concept in a such a simple way no one else can 😊

@tejal8382 Год назад

Hey, Philip I want to get tutions from you is it possible plz do reply 🤞

@tejal8382 Год назад

Can you plz help me with tutions

@DeepakKumar-rz9wq Год назад

I have no words to thank you enough for this video..!!! 👍

@yashghatlia Год назад

Hey Philip! I just gave my GRE today after binging through your over the past couple of weeks. Was initially struggling with time management throughout my mocks, but managed to get a 326 (163/163) today! Wanted to thank you for all the tips and tricks. Your channel is gold and I’m going to recommend it to everyone I know who’s preparing for the GRE! Cheers :)

@TheTestedTutor Год назад

Incredible. Well done Yash!

@takuminishi6789 Год назад

Hey Philip! Thanks always for the great content regarding GRE, personally I've never been more confident in quants after watching your in-depth videos. Just a question, do you have a dedicated quantitative content specifically to square roots (and/or cube roots)? If you haven't yet, I would be grateful if you can create about it soon! (cheers!!!)

@techbasics4481 Год назад

I'm from India and have recently started watching your videos. Completed almost all the playlists and indeed this is the video I've been waiting for. Thank you for all the teaching & content that is utilised by millions of students around the world. I have my GRE, a month from now approx. and wish me luck. Thanks mate :)

@TheTestedTutor Год назад

So glad! Good luck TB!

@pavansiddharth2279 Год назад

atb

@ally12345 Год назад

How was your Gre?

@umairahmed1773 Год назад

One of the hardest topics on GRE Quant. Really happy you considered it for a video. I wish you could arrange all your videos in a complete step by step course of quant and verbal. Please give it a consideration. Thanks!

@TheTestedTutor Год назад

I have! Check out my 5 week playlist

@umairahmed1773 Год назад

@@TheTestedTutor oh, I will check it. Thx Philips

@abelmayorga 3 дня назад

Great video. You made learning probability easier. Thank you.

@yazad_sarkari2002 27 дней назад

I swear this fellow is a genius the topic I wasn’t understanding at all I learnt it in one class kudos to this fellow very underrated channel……This guy is saving lives ❤

@gre341withsaadamer Год назад

Just saw this video of yours. Excellent content. Keep up the good work!

@TheTestedTutor Год назад

Thanks Saad

@esraamansour3405 Год назад

oh my god, this video is too hard for me, I need to practice more on probability problems, very valuable tips.

@ashishsinha9035 Год назад

Very good Philip!

@cholocatelabs Год назад

A great collection of questions:

@MindOverMatrix111 Год назад

Done with my GRE but um still watching Philip cause I love his content. ❤️

@TheTestedTutor Год назад

very cool

@b3ast407 Год назад

Thankyou very much!!, i am taking gre in 12 days, i needed exactly this.

@TheTestedTutor Год назад

Glad it helped and good luck Beast!

@b3ast407 Год назад

@@TheTestedTutor Thanks!!

@sanskrutisharma4197 Год назад

So helpful!

@hagoskalu7293 4 месяца назад

Your videos are amazing. Keep it up.

@payalpal4386 9 месяцев назад

Hi Philip, can you kindly include a detailed lesson on standard deviation and statistics, including a set of challenging questions.

@LEYLAKHANAHMADAZE 8 месяцев назад

Thank you, this was very helpful!

@valentinatoby3762 Год назад

Thank you phillip

@mumtahinahzia7312 Год назад

Awesome Mr. Philip..I have done magoosh twice but your videos are better and easy to understand...

@mumtahinahzia7312 Год назад

But I have one question..In the sibling question, why we didn't consider another scenario that if I take one child from second class (25 student class), and then first class, the total calculation would be (3/12*1/25) 0 +3/25*1/12) . Please let me know...

@msk27vlogs Год назад

Great Work Philip!!! Appreciate your work to give us such a useful tricks.

@sanarehmat8447 Год назад

Hi! As we know that Ets has increase the difficulty level of quant which is unjustified. Sir, you are in a position where people will acknowledge you and support you. Please collaborate with other Gre tutors and specialists to record your protest at this injustice to ETS. Sir, please. Thanks!

@TheTestedTutor Год назад

I have organised a march

@sanarehmat8447 Год назад

@@TheTestedTutor Hello Phillip! I have asked Mr Saad to speak out against the unfair difficulty level of the Quant section, as well as the overall GRE exam. I mentioned that you are also protesting against this. Today he has a live session with Gmat club. He said he'd mention it in today's session, and he asked me that I should remind you also. You all can collaborate together and protest to ETS against this.. Thanks!

@mostafadastgheib63 Год назад

Dear Philip, For the unexpected probability trick (48:01), shouldn't we take the orders into consideration, and do the calculations for another time when we first pick the sibling from the class of 25 and then 12? meaning: 3/25 multiplied by 1/12? and then sum it with your answer.

@TheTestedTutor Год назад

Because with the twins you NEED to pick a twin the first time (no twin = fail), and then you NEED to pick that twin's one sibling (which is why you don't multiply by all the twins in the second class). But with the bag you can EITHER pick up red first, then green OR green then red. It is a more flexible situation with more routes to success. It's the same reason we don't count H H (two heads) as different from H H (the same in reverse order). If we need two heads (like a twin pair) then first option must be a head (H), no alternative, no repeat or reversal

@reddaxtor5662 Год назад

Thanks teach!!

@ChessQuickies Год назад

Hi Philip! These are absolutely great videos, and have taught me so much! One request - could you make cloze videos? The type of cloze where you have to fill in the missing letters of words in a text? I know it usually doesn't come up in the GRE or GMAT, but it came up in my 11+ exam. Are there any techniques for being faster, or have a more efficient mindset for coming up with possible words? Thanks! Ps. (Not trying to be rude) If you don't have much information on cloze or can't find out what sort of questions it has - since it doesn't appear in GRE or GMAT - could you make distance videos? thanks once again

@ishworshrestha8361 11 месяцев назад

WORTH WATCHING

@ahmedalajlouni7173 Год назад

Out of a blue. Honestly you are amazing. Incredible! How did you know exactly where I fail? Are you such a wizard?😅 Actually I got insane when you mentioned where most of students got wrong. You're amazing bro. I am totally thankful for you, whatever I say is less then you

@vishrutmahi6593 Год назад

This is the best guy for GRE out there

@TheTestedTutor Год назад

Thank you. I agree

@thedialogues9435 3 месяца назад

A beginner Friendly video and also starts with question and explains the application along with it . Helpful to build concept at a grass root level which is very much important for Medium to hard level questions. so if somebody wants to start probability look this video first and then go else where

@sreejasree7427 Год назад

Thanks sir 😊

@VallabhEv Год назад

thank you so much for this video! the different kinds of problems were really helpful. love from india :)

@TheTestedTutor Год назад

Glad it helped!

@user-ph4sz9xc5e 9 месяцев назад

Hey Philip, For the question on 24:50, if I happen to choose the longer method of listing all the scenarios using letters and finding the probabilty, is there a way to determine that there are 15 such events. like how can I know that 15 events of snow and no snow is possible?

@JasmineKhamis-un6pb 11 месяцев назад

Hello Philip! I really can’t thank you enough for your videos; you’re helping accelerate my studying by light years! I just have a comment on this particular video about the ‘independent’ question; we computed the answer of 0.18 but it is none of the multiple choices given. Did we miss a step? Or was it the wrong set of answer choices?

@sathyanaarayan3694 9 месяцев назад

Hi Philip same doubt here!

@nailahasan7827 10 месяцев назад

@The Tested Tutor, in case of disguised venn diagram, I have something to say. Actually the the probability of both event occurring is (0.4 * 0.5)=0.2=20%, Otherwise it doesn’t get matched with probability logic of two independent events. If they weren’t independent, then the word “both” wouldn’t come here. Please tell me if I’m wrong here.

@patsy7514 Год назад

41:11 Why should it be one choice followed by another choice and not picking both gloves simultaneously? Which part of the question helps us come to this conclusion?

@nanabaffour8820 Год назад

Please how will you know whether you need to work out what you're not asked for and subtract from 1 or to work it out straight away?

@MariaRomero-bw7uy Год назад

Hi Philip, thank you so much for your videos. I followed everything, but I have a question. In the twin example at the end of the video (around min 46) don't we have to add the probabilities of the other two sets of twins? Making it 3%

@qt_pi6504 Год назад

this is beautiful

@dilbarmm10 Год назад

Hello Philip, In 19:23 what's the importance of "the next two interviews"? If it is the next 3 interviews would the answer be the same?

@adeolaadeniran7566 Год назад

Hello Phillip, thank you so much for the videos, I’m especially grateful for how to break down difficult concepts 😊. Regarding the first question on calculating opposites (@25:28) why can’t we just multiply 1/4 in four places, instead of calculating opposite and back to subtract from 1? Thank you

@abhishekkhanna1349 Год назад

if u multiple 1/4 in all 4 places that would mean that it is raining on all four days.

@mdsajjadali4343 Год назад

Hi Philip The 2nd last problem that you did 45:00 about twins, don't we have to do it like the way you did about the green and red beads 14:00

@shwetaparajuli3868 Год назад

I too was thinking exactly the same 😂

@amrithas182 Год назад

38:18. Are the options wrong? I don't see any that correspond to the answer 18 percent..should we mark the answer closest to the answer figure?

@davidblainex14 29 дней назад

hey philip, i have a question.... what if on the GRE exam it does not specify whether or not the beads are not thrown back into the bag.... do we just automatically assume they are not? Thanks so much!! :)

@palakjangra8808 Год назад

Hi philip I am planning to take my gre in 2023 so I want to know if I will do all videos of your channel can I able to crack my gre with out any coaching??

@VishalSingh-cj1pr Год назад

Hi Philip - Thank you so much for posting these videos. These are wayyyyy better than bulk of expensive materials available online. Have a quick query on the question at 47th minute. The answer I am getting is 2%. The probablity of picking a twin could be (pick first from class 1 and then from class two) or (pick first from class 2 and then from class 1) Sceanrio 1: 3/12 x 1/25 or Sceanrio 2: 3/25x 1/12 = 1/100 + 1/100 = 2/100 Please correct me if i am wrong. and thanks again.

@VishalSingh-cj1pr Год назад

could it be because everytime questions mentions at random, I don't have to consider the order in which they are selected.

@palakgupta3116 10 месяцев назад

Hey Philip! Why aren'y we considering the order in the second unexpected probability trick question? like what if 1st child is selected from the larger class, it is not specified

@Kut_Kut Год назад

Hiii Phillip I just want to say THANK YOUUU🤗 for all these videos. I took the GRE today and it didn’t go as planned, looking to take it again. What advice can you give me to be able to improve my score drastically Looking forward to your reply Thank youuu 🙏🏾❤️

@TheTestedTutor Год назад

You're welcome! Have you completed my 5 week playlist?

@Kut_Kut Год назад

Thank you for replying. Yes I did. Excluded one or two videos because of time but I have watched 96% of all your videos.

@TheTestedTutor Год назад

@@Kut_Kut Have you managed to take and review all 5 ETS tests?

@bagdad29-0 Год назад

Phillip, Thank you for your fantastic content! Currently, I am on the week 5 Quant at your playlist. Suddenly, the playlist changed, and I found the probability part on week four, which was in the week 5 playlist. Don't you think probabilities belong to the week 5 playlist? I am lamenting!

@TheTestedTutor Год назад

Yes will sort that don't worry. It is because this video now has everything on probability.

@bagdad29-0 Год назад

@@TheTestedTutor Yes!! Great video Indeed. We appreciate your hard work, Brother!

@samikshyaaryal9881 Год назад

Hey philip! I have a query regarding last question. On computing total we have already divided by 2! to avoid redundancy due to double S then why is it necessary to take 2 choices for the want?

@TheTestedTutor Год назад

Hey Samikshya, an amazing spot, very well done. 2/120 works or 1/60 (depending on if we adjusted for the 2!) but not 1/30. I have edited the video to simplify. Do check out my Letter Arrangement video for further practice.

@faisalrashid9415 11 месяцев назад

Hi Philip. For the independent question, why did we not just multiply probability of P occurring 0.3 with probability of Q not occurring 0.6?

@samuelosei-nketiah2130 Год назад

Hello Phillip. Excellent video! Although, I am a bit confused about the twins question. Why weren't the ways of picking the siblings considered like in the case of the red and green marbles, please?

@TheTestedTutor Год назад

@samuelosei-nketiah2130 Год назад

@@TheTestedTutor Thank you very much. And uh.. wish me good luck!! Thank you.

@maameefuamensah 7 месяцев назад

21:32 I am really confused. why didn't we find Philip x Christina + Christina and Philip like we did with the red and green balls when we found redx green + green x red? What is the difference? Please help

@ameyashirali4371 Год назад

What if we have 3 beads will this concept will be applicable on them too?

@Srg9000 Год назад

Hi Philip, thank you for providing great videos! I have a doubt at 38:15 in the independent probability section, the soluton is 0.18 but that doesn't match any of the options

@TheTestedTutor Год назад

Well spotted ctlr! My mistake, forgot to switch to decimal answer choices. Answer is indeed 0.18!

@dx5151 Год назад

9/50 will be the answer, right?

@TheTestedTutor Год назад

@@dx5151 as a fraction, yes

@Srg9000 Год назад

@@dx5151 as a fraction, yes, i think the options were from the last question

@seabasschukwu6988 2 месяца назад

thx 4 help m8

@ronakpunase80 8 месяцев назад

I have a doubt at 38:16, what is the correct answer? The concluded 0.18 does not matches with any of the options, what am I missing?

@gagandeeparora7727 Год назад

Hi Philip! Thank you for this amazing and very helpful video session. Also, I had just one question in the 'Unexpected Probability Trick' at 48:00, Shouldn't we consider both the combinations Picking a Student from First class and then picking from larger class and vice-versa? In case that the probability would be twice of the current answer.

@theresalouise4077 Год назад

It’s what I thought so too. Because they didn’t specify the order of picking the students

@patsy7514 Год назад

Thank you... I was about to ask the same thing. Additionally, don't we have to consider the 'twin 1' OR 'twin 2' OR 'twin 3' when computing the first choice? In your first choice, you can either pick 'twin 1' or 'twin 2' or 'twin 3' in which case the probabilities need to be added.

@gerardtyson2274 Год назад

37:00 can also use complementary rule (1 - 0.4 = 0.6) then do 0.6 * 0.3 = 0.18.

@reinhmr Год назад

Yeah, but 0.18 is not an answer choice and none of the given answers corresponds to it. In fractional form 0.18 would be 9/50, no?

@gerardtyson2274 Год назад

@@reinhmr in other comments on this video, the uploader has confirmed that the corresponding answer choices he posted for that question aren’t the correct ones. 0.18 is still the correct answer. If you scroll down to older comments posted 8 months ago (at the time I’m writing this) you should find it. Such comments reference time stamps around the 37 or 38 minute mark.

@reinhmr Год назад

@@gerardtyson2274 Thanks, Gerard. I should have read the whole thread before commenting. Great video, btw.

@nikhilt3486 Год назад

Hey Philip! Just one query at 21:00 "one of many question", why is 9C3/9C4 wrong solution?

@SathishKumar-23 Год назад

I'm really really waiting for this topic. Actually I make this comment befor watch this, but after saw the thumbnail I got self confidence that ok, don't worry about probability. I will nailed it on exam. Wise me luck dude. I'm going to appear on my gre within 10 days..! And thanks for all and everything 💟. Luv from India.#

@TheTestedTutor Год назад

Best of luck Sathish!

@dawitkefyalew2618 9 месяцев назад

how was your result, am going to take it soon ?

@donambrosini4585 26 дней назад

Hi Philip, I had a doubt on the @44:48 question, Shouldn't there be two cases - Case 1 - As you explained 3/12 X 1/25 + Case 2 - 3/25 X 1/12

@amrithas182 Год назад

At 48:10 shouldn't we consider two different cases of either the first twin was taken from class with 12 students and also the case where first twin was taken from a class of 25 students? Why did we only consider one case?

@williammcglone6515 Год назад

I was thinking the same thing, which is why i thought the answer was 2%... help Phillip! @TheTestedTutor

@krishchowdhary Год назад

Sir Thanks a lot for your really helpful videos but for the last question isn't there a 2% chance in case one you are selecting 3/12 and then 1/25 but in Case 2 we can select 3/25 and then 1/12; therefore either itis case 1 or(+) Case 2, So we add them to get 2/100? Just like we did in the beads question when we had to select either red or Green beads.

@JasmineKhamis-un6pb 9 месяцев назад

Hello Philip! Thank you so much for those videos; they’re nothing short of GOLD! In regards to this video, the Independent question of events P and Q. We concluded the answer 0.18 or 18% as the answer, but it is not one of the answer choices. Is there an additional final step? Or was it merely the wrong set of answer choices?

@debasismandal1924 9 месяцев назад

I was wondering the same thing as well.

@raining3110 Год назад

Hi philip, for the question at 38:17 on independent, can't one just get the answer fairly quickly by using the probability of p happening which is 3/10 times q not happening witch is 6/10, and that would be 18/100?

@TheTestedTutor Год назад

But that's just p only happening. What about q only?

@raining3110 Год назад

@@TheTestedTutor Thanks for the reply philip! I actually took the GRE today, your math tutorials have helped me get 166 in quant in the first try. You are awesome!

@TheTestedTutor Год назад

@@raining3110 amazing! Well done

@Manojkumar-dg7tj Год назад

Hi Philip, Apparently the news is that GRE quant difficulty has increased significantly and the official materials do not replicate this. Is it possible to give in better insights as to what is happening

@jineshjain3716 11 месяцев назад

Probability: 31:00, 33:00 (Independent Prob), 39:00, 50:00

@rujekomacheka6393 Год назад

Hello Phillip, So what is the answer at 38:12 Phillip? The explanation there is not clear.

@anishjoshi1999 10 месяцев назад

love from nepal

@praggo2841 Год назад

Hi Philip! I was asked a question on Probability Distribution on my GRE last week. It goes something like this - A set of values of X and their corresponding P(X) were given. Similarly, a certain set of values of Y and P(Y) was given. Question asked - Quantity A Quantity B X Y I had no idea how to solve this. Could you please help with this. I know I don't remember values but a hint would be great!

@AmarachiKonyeaso 11 месяцев назад

I think the answer is D. The information doesn’t seem sufficient enough

@patsy7514 Год назад

48:08 why aren't these independent selections? Why do they have to occur one after the other? Which part of the question gives us this idea? If the selections occur simultaneously, then the answer is 3%. i.e (3/12 * 3/25)

@trisha.sarkar Год назад

Hey Phillip, in one of many - if Phillip and Christina are picked, wouldn't we consider both orders P C and C P? How do we know we don't need the orders?

@TheTestedTutor Год назад

Doing the orders will work and get the same answer but there are so many, like CPNN, PCNN, etc that it is simpler to do the shortcut of just multiplying as shown.

@trisha.sarkar Год назад

@@TheTestedTutor thanks! Is there a specific trick to identify one of many questions ?

@temptemp4106 Год назад

Hi Philip, Thank you for your videos, they are very helpful. I wanted your help to get more clarity in disguised venn diagram question. It asks for probability of exactly one event occurring. I tried the following - P (Exactly one event occuring) = P( A occurring AND B not occuring) Or P ( A not occurring AND B occuring) = [0.4 x (1-0.5)] + [(1-0.4) x 0.5] = (0.4 x 0.5) + (0.6 x 0.5) = 0.2 + 0.3 = 0.5 ( i.e., 50% option E) I am not able to understand where I am making mistake. If anyone else can point out the mistake, please help.

@bienvenidos9360 Год назад

The probability of B not occurring = 10% chance that only A occurs + 40% that neither event happens. Similarly the probability of A not occurring = 20% chance that only B occurs + 40% that neither occurs. So you're including portions of A and B again in your total. So the probability of only A =( probability that B or the probability that neither event occurs) not occuring = 1 - (.50 + .40) = 0.10 The probability of only B =( probability of A or the probability that neither occurs ) not occurring= 1 - (.4 + .4) = 0.20 So the probability of only A or only B = the sum of these amounts. 0.10 + 0.20 = 0.30

@hemanth_chowdary111 Год назад

Hii Sir i practiced all problems in Manhattan 5lb is it enough for gre

@ryanmwaniki6266 2 месяца назад

Pls answe this question. Why do we multiply when the question says And? I don't understand why

@VedankPande Год назад

For the first question in the disguised venn diagram section, why doesn't A(1-B) + B(1-A) work?

@bienvenidos9360 Год назад

1-B includes a portion of event A. Similarly 1-A includes a portion of event B. So you're including extra portions of both A and B in your final total.

@fashionstyle12346 10 месяцев назад

hey im really confused why you didnt simply use the combinations formula for some questions?

@reinhmr Год назад

At 37.44, you give the answer that the probability of P not Q as 0.18. But the answer choices are in fractions, not decimals and none of the answer choices represents 0.18, which is fractional form would be 9/50, no?