SOLUTION: nCr/nCr-1 = (n-r+1)/r prove it

Question 947547: nCr/nCr-1 = (n-r+1)/r
prove it
Answer by Edwin McCravy(20056) (Show Source): You can put this solution on YOUR website!

To prove:



We begin with the left side and we show that
it equals the right side:
















Write (n-r+1)! as (n-r+1)(n-r)! and r! as r(r-1)!







Edwin

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