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find-k-0-n-C-n-k-3-




Question Number 72395 by mathmax by abdo last updated on 28/Oct/19
find Σ_(k=0) ^n (C_n ^k )^3
$${find}\:\sum_{{k}=\mathrm{0}} ^{{n}} \left({C}_{{n}} ^{{k}} \right)^{\mathrm{3}} \\ $$

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