GMAT GRE - Difference btw Permutation and Combination

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Опубликовано:

31 май 2024

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Комментарии : 12

@user-wk9zb5tn4i 5 месяцев назад

Excellent Video Mr. Jackson. Very Informative & Easy to understand solutions

@jackson_kailath 5 месяцев назад

Glad it was helpful!

@user-wk9zb5tn4i 5 месяцев назад

Violations part is bit tricky here. Got confused and had to repeat the video several times. Is there that we can have the violations also expressed in the Selections / Combinations format? like 8C3 - NCP ways to arrive at 56 - 32?

@jackson_kailath 5 месяцев назад

we can express 24 as 4C1*6C1 ( choose one set of twins is 4C1 and choose any one from remining 6 is 6C1 ). With practice this will become easier. So 32 = 8C3 - 24 = 32. Hope this helps

@MrSasec 5 месяцев назад

@@jackson_kailath Excellent point. It is clear for me now. Thank you so much

@MrSasec 5 месяцев назад

Hello Mr. Jackson! I hope you had an excellent Christmas celebration this year. I came across one DS question from Manhattan GMAT which is bit confusing while forming algebraic equations. Need your help in getting it the confusion cleared. Here is the question: Answer to this is (B) The number A is a two-digit positive integer; the number B is the two-digit positive integer formed by reversing the digits of A. If Q = 10B - A, what is the value of Q? 1. The tens digit of A is 7 2. The tens digit of B is 6. The solution used variables (X&Y for A&B)

@jackson_kailath 5 месяцев назад

Hi MrSasec, Thanks for your wishes and message. Pls find the explanation to your question below. A = 10X + Y B = 10Y + X Q = 10B - A = 10(10Y + X) - (10X + Y) = 99Y Y is the unit digit of A and the tens digit of B Hence the answer is B as statement 2 gives us the tens digit of B Hope this helps. Regards, Jackson

@MrSasec 5 месяцев назад

@@jackson_kailath Hello Mr. Jackson... Thank you so much for your response. Actual confusion was the equations formed for A & B. I assume XY is a 2 digit positive integer for A and so it becomes YX for B. So, if I substitute these values in the equation for Q = 10B - A like Q = 10(YX) - XY. I could not make out further. When I looked at the solution, I find the equations for A and B as A= 10X + Y & B= 10Y + X ( I don't understand how these equations are formed). I'm sorry for repeating the same question. Please see if you can help me with the equations formed for A and B. Remaining part is understood

@jackson_kailath 5 месяцев назад

Let me give you an example, the number 23 =2*10+3 so xy =10x +y

@MrSasec 5 месяцев назад

@@jackson_kailath Thank you so much Mr. Jackson. Very nicely explained. You are always awesome and prompt at clearing our doubts with ease. I understood the solution by your example of using the number 23 & 32 which that forms these equations A(XY 23) = 10X + Y (as 10.2 + 3) & B(YX 23) = 10Y + X (as 10.2 + 3). From here, remaining part is simple.

@viveksaxena7376 5 месяцев назад

Sir i have gone through your udemy video. Sir please tell me how can i prepare wile working in tcs or corporate. I don't want quit my job and want to prepare i think u have prepared sooo while in corporate as per your linkedin. You r inspiration plz tell us the path.

@jackson_kailath 5 месяцев назад

Thanks for suggesting this. I will make a video on how to prepare for exams while working a full time job.