A librarian stacks books so that 7 books are on the first shelf, 10 on the second…

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

Problem

A librarian stacks books so that 7 books are on the first shelf, 10 on the second shelf, 13 on the third shelf, and so on, forming an AP. How many books are placed on the 18th shelf? (a) 6161 (b) 6464 (c) 5858 (d) 5555

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