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prove-that-n-N-k-0-2n-1-k-C-2n-k-2-1-n-C-2n-n-

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Question Number 35037 by abdo mathsup 649 cc last updated on 14/May/18
prove that ∀ n∈N Σ_(k=0) ^(2n) (−1)^k ( C_(2n) ^k )^2 =(−1)^n C_(2n) ^n .
provethat∀n∈N∑k=02n(−1)k(C2nk)2=(−1)nC2nn.

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