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Numbers 3 || Number Systems || CAT Preparation 2024 || Quantitative Aptitude

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Number System by Ravi Prakash | Quantitative Aptitude for CAT 2024
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CAT 2024 || Verbal Preparation
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CAT 2024 | Logic Reasoning and Data Interpretation
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CAT PREPARATION 2024
How to Prepare for Quantitative Aptitude
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24 авг 2024

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Комментарии : 421

@nishanthhonna8406 3 года назад

This is awesome sir . Helping so many poor students who cant afford coaching. Hats off to you sir

@experimentointerneto902 3 года назад

Can u tell the subtopic arrangement of watching number system.. Bcoz i think its mixed up

@GOKU-tt6zl 3 года назад

@@experimentointerneto902 it's not it's in order

@Someone7676 2 года назад

Bhai hum toh coaching bhi jate h but vha inka 10% bhi ni pdhate .... time center m

@Harrystyles0004 2 года назад

@@Someone7676 sahi kahe bhai

@hetbhatt9441 2 года назад

What was your cat score

@shruti9557 2 года назад

You just proved that legend do exist!.....BEST CHANNEL I'VE EVER COME ACROSS!....(kudos)

@hiraburney3123 3 года назад

Thank you for this. You are providing help to so many non maths aspirants who even with coaching are unable to cope up. This is the best thing on the internet for me.

@aayushikashyap_ 10 месяцев назад

Maine bhot sare classes kiye h no. System k...no.systm k nam sun k hi bore ho jati thi bt...apke jaisa kisi ne ni pdhya ...u r jst amezing sir... thanks to maa Durga jo apka channel mila❤️..lots of respect frm bihar😊

@amitsahu4782 2 года назад

It’s really great to have u helping us in this way.arguably the best content I have ever had in RU-vid for helping the aspirants for free.

@kundanahmed4465 День назад

This channel brings out the logic behind numbers. All of these are available in books, but the way he correlates stuffs makes learning an enjoyable exercise.

@vankaryash3142 3 года назад

a^2 - b^2 = (a-b) (a+b)

@sushantjha8373 5 лет назад

Amazing video. This has to be arguably the best online content. The concepts taught and even the level of questions are terrific. Kudos sir !

@Rodha 5 лет назад

Thank you

@jibinjoby9523 2 года назад

Bro did u wrote cat exam

@zoro3188 2 года назад

@@jibinjoby9523 yes I did

@AyushKumar-wl8cx 2 года назад

@@zoro3188 Coaching ya self study bro??

@hetbhatt9441 2 года назад

What was your cat score?????

@navreetkaur1215 2 года назад

The digital sum of 973 is 9+7+3=19 19= 1+9=10 10=1+0=1 but '1' is neither prime nor composite. Does that mean the digital sum method cannot be applied on this question?

@zeenatkhan1575 6 месяцев назад

Op 😂😂

@Nilotpal_Chakravarty_ 2 месяца назад

it can be applied the digital sum of 973 is 1 which means it cannot be determined with the digital sum if it is prime or composite. Note, that the digital sum is like a negative test it guarantees that the number is not prime if the DS is 3,6,9 but when we get any other answer the primality of that number is undetermined.

@vijayaj9691 Год назад

1000001 how it can be 10 to the power of 6 ? 10 to the power of 5 only gave100000 pls clarify my doubt ! .

@venkateshV-ss4lc 5 месяцев назад

10*10*10*10*10*10 = 1000000. You should aware of the zeros. 10 lakh has 6 zeros on it. 1 core has 7 zeros on it. Check for power table you will understand.

@rhutvigawai5672 3 года назад

Sir , thankyou so much for everything you have done students like us who can't afford coaching are blessed to have you.

@tusharrj6578 3 года назад

In video at 17:35 I have query is 101 is prime number right...but sir telling 101 can't be prime number how? Can you tel me plz rhutvi

@yashmehrotra6201 3 года назад

@@tusharrj6578No Tushar sir is not saying that 101 is not a prime number. He is saying that if we multiply 101 with the other factor it can't be prime anymore because then we will have 3 factors of 1000001 that are 1, 101, and 1000001. Therefore, 1000001 is a composite number.

@yesiamnoob9192 Месяц назад

@@yashmehrotra6201nice explanation bro 💜

@digvijaysingh1997 3 года назад

1007 is not a prime number but 1007^2-1 is perfectly divisible by 24 and 1007 numeric digit sum is 8 i.e. not 3, 6 or 9, so we cannot find if a number is prime or not by these two methods. am I right???

@official.frostburn 2 месяца назад

Guys stick with the prime method where we find the square root of the number closest to the given number to find whether the number is prime or not. It's the most reliable method but lenthy.

@Ok12376 3 года назад

a square + b square = ab+ab+1 But this only applies.for square and not for every even exponent.

@batulrizvi8390 3 года назад

Sir. HOW ARE YOU SO AMAZING!!! Thank you for this

@vinaymetri7706 Год назад

18:04 Sir you have written a^2 - b^2 = (a-b)(a-b) Sir it should be (a+b) (a-b)

@maitrisinghai 7 месяцев назад

bas ye hi comment dhoondh rahi thi

@poojab4967 5 лет назад

Amazing online content till date.You are just amazing.keep going sir.

@harshithaksubramanyam6135 4 года назад

hope you would have completed writing your cat . can i know how much did his videos help you

@abhinavsharma341 3 года назад

@@harshithaksubramanyam6135 pta lge toh meko bhi btana

@shivampruthi6833 9 месяцев назад

@@abhinavsharma341mujhe bhi bta do

@aminahamadkhan3766 3 года назад

i didnt get the logic for square root for finding its prime no. or not at time 7:51 Any one up there who got the logic ???????????????????????????????????????

@ujwalkachade3459 2 месяца назад

24:37 it is not always divisible , it is divisible by a+b only if n is odd...take a = 2 n = 2 b = 1, 5 is not divisible by 3

@dineshkhandelwal6725 Месяц назад

you said by digital sum we can see if a no. is prime or not , so tocheck 1000001 is prime or not when we add we get 2 so it should be a prime no right ? why did u say its not prime?

@Brad-ne6ld 5 дней назад

I was thinking the same, did you got the answer???

@ahmedshaikh6053 2 года назад

Thank you so much sir for this awesome session❤️

@durgamishra7994 Год назад

Sir, the number 973 should be a prime number by the p2-1 divisibility by 24 rule, as 973 square minus one is completely divisible by 24. Kindly clear the doubt sir

@rahulgeorge7502 6 месяцев назад

reverse is not true.

@Ridhima-ki3wh 7 месяцев назад

Q - Is 1000001 prime or composite? Sol - We can simply check the digital sum and hence it is not a prime no. Is this way wrong?

@PRATHYUSHAVENNAPUSA 4 месяца назад

I think no we shouldn't apply because if the number is a prime number for it's checking only we can apply that

@PRATHYUSHAVENNAPUSA 4 месяца назад

Here digital sum is 2 know according to the rule it should be a prime number but it is not a prime number

@samratpatel8060 Месяц назад

@@PRATHYUSHAVENNAPUSA when the digital is 3,6 or 9 we are SURE that the number is not prime when the digitalsum is something else we conclude that we are UNSURE hence have to resort to using other option

@anuragtripathi4040 4 года назад

at 4:38 you should also check with 5

@keerthanachandrasekhar 3 года назад

no need, it is common sense, 114 does not end with 0 or 5

@nikhithamk5865 2 года назад

Thankyou so much for these videos . I ' m a IIM aspirant who is not able to affort coaching classes. Your classes are really helpful for students like me. Where can we get the practice questions for these sessions?

@tanvigupta4842 3 года назад

Sir as you said digital sum of prime number be 3,6 or 9 with example 949876=9+4+9+8+7+6=43=4+3=7 Here this is not a prime no then how digital sum will give prime no.? Plz explain

@malavikamadhav7345 24 дня назад

Thank you sir for your class🙏Greatful for your dedication❤

@user-nd3wn1dq4z Год назад

Sir this is immense help I'm really grateful for this, as maths was something I was really afraid of I'm currently in class 11th , I don't have maths but I'm confident your lectures will lead me to the IIMs . Thank you!!

@brajmohanupadhyay1753 3 года назад

You say digit sum can never be 3 , 6 or 9. But in 973=9+7+3=19=1+9=10=1+0=1 so it's a prime no but it's not please explain sir

@whyclub4448 Год назад

Sir, u said 1000001 ,is NOT a prime number....BUT, if we apply the DIGITAL SUM method, its sum is not equal to 3,6 or 9...then it is a PRIME NUMBER right...??

@samratpatel8060 Месяц назад

the statement was "Digital Sum of a prime number can never be 3,6 or 9" Nowhere its mentioned that numbers whose digital sum is not 3,6, or 9 is a prime number. ie reverse is not true

@officiallodhi3967 3 года назад

Better than unacademy ✌✌✌✌✌✌

@AmanVerma-je2pp 3 года назад

According to digital sum method- 11111111 1+1+1+1+1+1+1+1=8 and it will be prime as it is not 3,6 or 9 but it is not a prime number......

@samratpatel8060 Месяц назад

reverse is not true

@sarthakpatra9261 2 года назад

as seen from the last example 973 is a composite number but it is satisfying the first 2 conditions at 11:15. I have a doubt here. Sir, can you please clarify this... Thank You

@catch_me_ifucan Год назад

you need to check with all the 4 conditions. if all 4 conditions satisfy then its a prime number

@gethingeorge4140 2 года назад

If A^n +B^n is divisible by A+B then what does it mean prime or not?

@AryanSingh-vi1oz 2 года назад

It means its not prime.. Because uss number ka ek aur factor aa gya h and kisi bhi number ke 2 se jyada factor hote hein toh voh prime nhi composite number hota h

@bhavyalukka601 Год назад

Sir i have a doubt, 1) On that question of 973 is prime or composte, can't we use that formula of digital sum can never be 3,6 or 9 So 9+7+3 = 19, 1+9 = 10 , 1+0 = so 1, so therefore it is a prime number, but in the same way as you explained it is also divisible by 7 ... Please show me where I am wrong?

@swetachundawat6640 11 месяцев назад

If digital sum of any no. is 3, 6, or 9, then the number is definitely not prime, however, the its converse is not true that is if the digital sum of any no. is not 3,6, or 9, then the no. not necessarily be prime

@bhavyalukka601 11 месяцев назад

I forgot the number system and will have to revise again 😅 Thanks btw

@AyushPandey-ys6yy 2 месяца назад

How he take that 1³ any logic bina kuch bataye le le rha hai how we know we have to take here 1³

@omagarwal2688 Месяц назад

1 ki power kuch bhi le skte ho 1 hi aayega dusre ki power se match karke

@shrutipandey3113 Год назад

1000001 = 10^6 + 1^6 n is even. Hence, we can't conclude anything. But if we write it as (10^2)^3+(1)^3. This tells us that it is not a prime number. How will we know which power to consider?

@spkbusinessD-- 3 года назад

shivam kamat (3) 30-7-2021 thank you sir🙏

@iamdavidaman Год назад

Digital sum of prime no. Will never 3,6or 9 but what about other numbers for ex 1234562 gives a digital sum of 5 and it is not a prime no. Can anyone help ?

@rayzoldyck8044 Год назад

gotta check for all the conditions

@iamdavidaman Год назад

@@rayzoldyck8044 it will be more time taking if i start checking for all 4 conditions

@samuraiplays7001 5 дней назад

21:05

@donaldrook9359 Год назад

Where can i practise question from this topic sir please reply 🙏🙏🙏🙏

@tiktokreel92 2 года назад

By degital sum prime ni sum can never be 3,6,9 but 7498 sum is 28-10-1 (it is prime) but no 7498 is a prime no ????

@harshmeanshappiness 4 года назад

Your are doing a great job👍

@shreyasjha18 6 месяцев назад

18:01 here it would be (a+b)(a-b)

@TheDHemant Год назад

Sir, very nice. Theory explained @ video time 10 minutes in this video,: Can it be used to find factors of a composite number? I.e. to know if we have found all the factors and furthermore finding is not required?

@jinujain8321 2 года назад

Tbh for basis not worth it - he uses concept that a normal person can't understand

@Rodha 2 года назад

Why can't u understand ? Put pressure on your mind.

@shwetaupadhyay8472 3 года назад

Only one word for you ....... Great ☺️☺️☺️☺️☺️☺️

@mauryaakash8979 3 года назад

Is the content for cat?

@ArambhHaiPrachand99 Год назад

@@mauryaakash8979

@zoro3188 2 года назад

At 18:34 a2-b2 =(a+b) (a-b)

@KhushiKumari-ll2ru 3 года назад

At 10:40 .....A number that is not divisible by 2 Can never be divisible by 6 ?? How is it true??

@gunjanroy5704 4 года назад

Thank you sir, This series of videos is very helpful to me, easy to understand and probably the best online content

@IshankChoudhary 5 лет назад

Sir ratvao Mt p and C ki trah ni h ye video Jada questions nhi h bs concept hai pta ni lagra kaise apply honge different type of question mai

@Antivenom932 4 месяца назад

Sir i will get 99% this time

@abhishekgaikwad5485 2 года назад

great videos very easily explained

@pujaraj5908 5 месяцев назад

You're doing god's work

@ironman2.026 2 года назад

1:00 Given P ≠ 2 or 3

@nazamwasi3357 2 года назад

973==9+7+3 19==1+9 10=1+0 1 can we say 973 is prime number from digit sum method.

@spxtfxre1 2 года назад

why does this channel not have 1mil subs??

@Harrystyles0004 2 года назад

Give a medal to this man

@richasingh9621 Год назад

Which section should we look after this ?? Factors 1??

@blossomshrivastava8834 3 месяца назад

Example: Is 100001 prime or composite? If we do this by DIGITAL SUM method then sum will be 2 and its prime right? Please let me know where I understood wrong.

@samratpatel8060 Месяц назад

when the digital is 3,6 or 9 we are SURE that the number is not prime when the digitalsum is something else we conclude that we are UNSURE hence have to resort to using other option

@user-wl8zz9vj6d 28 дней назад

Hello, thank you and very good explanation of the concept but where can i find the sums to solve? i need sums to apply the concepts.

@hussainpunawala6113 3 года назад

24:43 but sir if here we take 2's power as 2 so ans will be 5 n it is not divisible by 3.

@kamyakharya7776 3 года назад

2 is a even power....

@yashaswinitg9299 2 года назад

Thankyou so much sir 🙇 I couldn't afford it for much price

@dupkinhouse3159 3 года назад

in your last example , in 973, if you do by digital sum. it is coming prime as digital sum comes to 1. then why the ans are coming diff in 2 ways?

@vanshitadev5089 3 года назад

Ans can be diff but when it's 1,we know that digital sum of a prime no. cannot be 3,6, or 9..so it is a prime no. Similarly when a-b i.e. 10-3= 7 which is divisible by 973 is proved..that means it a prime no.

@hariharany9195 4 года назад

Hi sir Thank you for the amazing lecture One doubt in the last sum You said for a(n) + b(n), when n is even - nothing can be concluded. However in the sum you said for a(n) + b(n) - it is always divisible by a+b (even though it is even or odd) Please clarify

@shreyvarma9375 4 года назад

yes, you are right. but I think he meant that a(n)+b(n) is always divisible by a+b if it is odd only

@rishabgupta3419 3 года назад

Great explanation👍

@vikaspal3047 3 года назад

Prakash prakash Ravi Prakash😅

@plato4180 6 месяцев назад

Thank you so much sir!!

@rohit49..92 Месяц назад

thankyou sir......

@sailaxmianumula7554 Год назад

Perfect session.....

@omanohar12 3 года назад

very helpful , thank you

@piyushkumarsingh3439 Год назад

Part 4 is missing sir

@treasuretoyshop1674 2 года назад

if for a^odd - b^odd is 1 then it is prime or composite

@LivingWithSwastik 10 месяцев назад

Was liking it, but then continuous confusion in putting 0s, writing formulas etc started me to put in doubt, if I learn something now and that is a +- mistake of the teacher then I'll be the one confused going ahead, sad😢

@1morerep491 3 года назад

Please explain the last question

@dhananjaykumar7035 Год назад

According to digital sum 25 ( 2+5 =7) is a prime number because digital sum can never be 3, 6 or 9 . how????????????🤕

@bannanjehostel Год назад

sir kuch samaj nahi aya composite numbers ke😮‍💨😥

@tanishkamunjal2222 4 года назад

Sir, please recommend a book where we can practice the concepts taught by you. will be highly grateful :D

@pranjaltripathi1027 4 года назад

Arun sharma. Iahve pdf of this book. Its famous book for Quant

@mahimanigam3475 4 года назад

@@pranjaltripathi1027 you have the pdf ?? Can u share it ?

@allall8695 4 года назад

@@pranjaltripathi1027 Bhai sahab. Can you share it with me as well? Is via mail okay? If yes, my email is : realmek@outlook.com

@pranjaltripathi1027 4 года назад

@@mahimanigam3475 Okay i wil send

@pranjaltripathi1027 4 года назад

@@allall8695 okk sure

@ManuSrivastava_ 2 года назад

Thank you so much sir.❤❤

@karthikmadhusoodanan7274 3 года назад

brilliant sir

@Gautam_OG 2 года назад

2:30 6:00 11:00 17:00 24:00

@ShaliniBharadwaj-zp1nv 11 месяцев назад

Thank you sir 🙏

@harshthakkar6653 4 года назад

You are the best sir 💪

@nahishgupta4446 Год назад

When we divide 100001 with 6 , the remainder remains will be 5 , so the test wil be failed here

@sadasivamsubramoniam1305 2 года назад

Thank you sir

@spyder2374 5 лет назад

4:28 Prime no less then 11 should include 5... But it's not a matter, ..just bother me. So much writing mistakes...😒😒☹️

@manishramesh9344 4 года назад

Yeah it must Include 5

@aadishjain7454 4 года назад

Bhai free m jaan lega kya

@spyder2374 4 года назад

@@aadishjain7454 bhai accuracy is one of the most important factor while solving.....CAT

@mahimanigam3475 4 года назад

Tera naam to happy hai ??!!

@RSNsince Месяц назад

As in last part 7 and 3 r always divisible so it's composite rt

@vedantkatruwar4052 2 года назад

Thankyou so much

@rakshitmittal6288 2 года назад

Sir, Pdf notes are available of these videos.

@titikshauniyal3463 4 года назад

How is 1000001 not a prime number ? It is divisible by 6 and giving -1 as remainder . Please explain...

@honeyplays4626 2 года назад

in 6k-1 ,reverse isn't true and 1000001 can be factorized is 101 and 9901

@kinzakhann Год назад

Hey did you get this if yes pls tell 🙂

@Khushi.tawari1535 Год назад

6:27 Do it for 683 ???

@ShreyashChopade Год назад

683 = sq rt. 683 = P

@vaibhavtharwani2285 2 года назад

THANKS😀

@udaykiranuday1493 Год назад

Sir, the question is 3^193+5. If we replace the no. 3 with 4 then how to determine the ans is prime or composite. Bcoz even + odd is odd.

@aakritimittal4610 4 года назад

Sir...where can I get quizzes you were talking about the past years papers that you'll discuss?

@vinaychauhan983 4 года назад

sir is on unacademy now

@dineshbabu8831 Год назад

10:31 but why are we only checking divisibility of only prime factors....

@TheDHemant Год назад

Sir @4 minutes of video time, will it be easier to start with the smallest prime number? I mean any reason why you are starting from the largest prime number?