Find the sum of the first 20 terms of the AP

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

Problem

Find the sum of the first 20 terms of the AP 5, 8, 11,…5,\,8,\,11,\dots (a) 700700 (b) 660660 (c) 670670 (d) 13401340

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