PERMUTATION AND COMBINATION (P AND C) SHORTCUT//TRICKS FOR NDA/JEE/AIRFOCRE GROUP X/ CLASS 11 NCERT

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#permutationandcombination #ndamaths #jeemains #unknownteacher

[tonykakkar]

2 Min silence for those who are thinking this is a trick, This is a Formula Guys and we all taught about this in school

[Yoojin]

Those who have doubt in the 2nd question, here is the solution:-

Listen, if it would have asked "how many ways we can arrange it in" then the answer would be 2520 + 1 as the word "ACADEMY" is an arrangement itself, but it is asking "rearrange" that's why we don't count the word already given, because it is asking that in how many ways can we re arrange the word, so the total arrangements of the letters (A, C, D, E, M, Y) has in total 2521 combinations and 1 of the combinations is the word ACADEMY, hope you understood..

[kashishagrawal]

2520 is wrong, answer is supposed to be 2520-1=2519
Because the question asks in how many ways can the given word be REARRANGED so total ways of arranging are 2520 which include the original word academy so we need to subtract 1 from 2520
Hence ans is 2519

[XYZmemes]

Bro ans is 2519 because of rearrange 1is substrate from 2520
2520 - 1 = 2519

[OZxSAMAEL]

2519 hona chahiye logically bcoz rearranged bola hai karne rearranged ka mtlb hai ki unn sabhi tareeko me se ek tareeka wo v toh hai isliye (2520 -1)=2519

[sandeepyadav-oytp]

The right answer of second question will be 2520.

[artycraftywithtech]

Sir, I'm having doubt that if no letters are repeated means, what should we do? Can u plz give one example and explain

[TechDevin]

Ans.2520 😛maja aa rha h yese questions krne .me

[chetanagarwal]

Wow what a trick
In school level i have learnt 😂😂

[Aesthetic__vibes-IG]

7*6*5*4*3*2! Divided by 2!*1! Then 2! And 2! Cancels then answer is 2520 is answer

[aashishji]

2520 is the 2nd answer of this question 😀

[akashmishra]

Ans of 2nd question is 2519 cuz, when it comes to rearrange we must have to subtract 1 from the conclusive number, ...., 7!/2!-1= 5040/2-1=2519....so correct option is not given..

[jewelhannathomas]

If the letters of the word “ATTITUDE” are written down at random, then the
probability that no two T’s occur together is? How to find probability in this case?

[jaipursarangi]

Bohot accha laga apka short we need more

[yogeshthakur]

It's not a trick. Just a formula already given in textbook

[gladdygladdy]

It's okay the answer for second one 2520 but they asked to rearrange right then the given word can't be included so we should sub that one occurence right???