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Math Help - Need help with combinatorics

  1. #1
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    Need help with combinatorics

    We were asked to prove that for any integer n sum of C(n,2r) for r >= 0 is equal to sum of C(n,2r-1) for r>= 1 where C(n,r) is choosing r objects from n objects.
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  2. #2
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    Quote Originally Posted by sthato View Post
    We were asked to prove that for any integer n sum of C(n,2r) for r >= 0 is equal to sum of C(n,2r-1) for r>= 1 where C(n,r) is choosing r objects from n objects.
    Write down the binomial expansion of (1-1)^n (which is equal to 0, of course).
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