Combinatorics: N choose K, permutations and subsets

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Uploaded by on Apr 21, 2010

Why is n-choose-k the correct way to count stuff.

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Education

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  • now i got it thank u

  • i dont get it.now is this proof of coefficient of binomial theorem?

  • Really cool! I've always wondered the reasoning behind this. Understanding formulas always helped me recall it and now I'm sure to never forget what N choose K means or the formula. Thank you.

  • Best explanation ever! Iv'e been taught that thing in Spanish for many years and never understood why you do that procedure. Now I finally made it. Thank you!!!

  • thank you, just what i was looking for; a simple example illustrating what the notation n choose k means

  • thanks

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