Calculate the value of .

MATHEMATICS · Single correct · A Level · Mathematics · Sequences and series · Sequences and series

Problem

Calculate the value of ∑k=120(7+3(k−1))\displaystyle\sum_{k=1}^{20}\bigl(7+3(k-1)\bigr). (a) 740 (b) 710 (c) 670 (d) 646

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