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Prove-that-r-1-2n-1-1-r-1-r-2n-C-r-n-n-1-




Question Number 24010 by Tinkutara last updated on 11/Nov/17
Prove that Σ_(r=1) ^(2n−1) (−1)^(r−1) ∙(r/(^(2n) C_r )) = (n/(n + 1)) .
Provethat2n1r=1(1)r1r2nCr=nn+1.

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