SOLUTION: Use the definition (n) (r) = n!/ r!(n-r)! to prove that (n) = (n ) (r) (n - r) This is from a binomial theorem part of a textbook. The n and r are in t

Question 939593: Use the definition
(n)
(r) = n!/ r!(n-r)! to prove that
(n) = (n )
(r) (n - r)
This is from a binomial theorem part of a textbook.
The n and r are in the same bracket with the letter n on top of r.
Also (n and n-r) are in the same bracket too with n-r being under n.
Sorry I wasn't sure how to write this question properly on a pc.
Any help on this would be appreciated.
Answer by Edwin McCravy(20055) (Show Source): You can put this solution on YOUR website!



Replace r by (n-r)   







Edwin

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