To prove: A combinatorial equation is ∑ k = 1 n k ( n k ) 2 = n ( 2 n − 1 n − 1 ) and let n and k be integers.

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Chapter 5, Problem 28E

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To prove: A combinatorial equation is ∑k=1nk(nk)2=n(2n−1n−1) and let n and k be integers.

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