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Prove-that-r-0-n-r-n-r-2-n-2n-1-n-1-

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Question Number 36784 by Joel579 last updated on 05/Jun/18
Prove that Σ_(r=0) ^n r ((n),(r) )^2 = n (((2n − 1)),(( n − 1)) )
Provethat∑nr=0r(nr)2=n(2n−1n−1)

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