CORRECTION AT 13:51 - I accidentally added 4 twice. Sorry about that. n + r - 1 is 8 + 4 -1 = 11. It should be 11C4 = 330. Thanks @Sport Master for pointing this out.
@dquixal77
Жыл бұрын
Seven people in a room. How many handshakes are made? 7! / 2!5! person A handshakes the others and go out the room (6) person B handshakes the others and go out the room (6+5) At the end we have 6 + 5 + 4 + 3 + 2 + 1. A triangular number! isn't that beautiful, considering that factorials are the same but with multiplication? In fact, 6! is 6 * 5 * 4 * 3 * 2 * 1 and sixth triangular number is 6 + 5 + ... + 1. this problem is a combination poblem. But it's a permutation problem as well. It's a permutation of two groups of letters: YYNNNNN And combination with repetition is a permutation of bars and stars. Everything is a permutation! Combinatorics is beautiful
@gulamnabikagathala3762
Жыл бұрын
Just sees you 2 years old video power set very help full thx Form India
@WrathofMath
Жыл бұрын
Thank you for watching!
@rubym420
4 ай бұрын
I have a test tomorrow and this helped so much!
@karthik6178
2 ай бұрын
I like your videos ❤ from india ❤
@WrathofMath
2 ай бұрын
Thank you!
@sportmaster2586
Жыл бұрын
Mistake in the final example Sir. Should be 11C4 I think. Great video!
@WrathofMath
Жыл бұрын
Drats, can't believe I missed that in editing! Thanks!
@AnalystQ1776
Жыл бұрын
Your videos, including the ones on set equality proofs, are excellent! Very underrated channel. Thank you and hope you get more recognition/subs!
@firstname4337
Жыл бұрын
combinations always confused me because "order does not matter" -- but for combination locks order DOES matter
@WrathofMath
Жыл бұрын
Yeah they should definitely be called permutation locks! Oh well.
@AnalystQ1776
Жыл бұрын
@@WrathofMath HAHA such a nerdy joke but I like it
@rubym420
4 ай бұрын
You look a lot like Freddie Highmore!
@ABagofDeadSquirrels
Жыл бұрын
What calculator program is that? Mine is not as user friendly
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