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find-S-n-k-0-n-k-2-C-n-k-2-




Question Number 66798 by mathmax by abdo last updated on 19/Aug/19
find S_n =Σ_(k=0) ^n  k^2  (C_n ^k )^2
$${find}\:{S}_{{n}} =\sum_{{k}=\mathrm{0}} ^{{n}} \:{k}^{\mathrm{2}} \:\left({C}_{{n}} ^{{k}} \right)^{\mathrm{2}} \\ $$

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