Determine the value of .

MATHEMATICS · Single correct · AoPS · Mathematics · Sequences & Series · Sequences & Series

Problem

Determine the value of ∑k=120((k+1)3−k3)\displaystyle \sum_{k=1}^{20}\bigl((k+1)^{3}-k^{3}\bigr). (a) 92619261 (b) 80008000 (c) 92609260 (d) 92409240

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