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Question Number 201839 by depressiveshrek last updated on 14/Dec/23

Commented by depressiveshrek last updated on 14/Dec/23

The last one means: Σ_(i=0) ^k i^2 ((k),(i) )=k(k+1)2^(k−2)

Thelastonemeans:∑ki=0i2(ki)=k(k+1)2k−2

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