Calculate the value of .

MATHEMATICS · Single correct · CBSE · Mathematics · Arithmetic Progressions · Arithmetic Progressions

Problem

Calculate the value of ∑k=120(3+4(k−1))\displaystyle \sum_{k=1}^{20} \bigl(3 + 4(k-1)\bigr). (a) 860860 (b) 820820 (c) 16401640 (d) 800800

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