A triangular arrangement of bricks has 15 rows

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

Problem

A triangular arrangement of bricks has 15 rows, with 1 brick in the first row, 2 bricks in the second row, and so on. How many bricks are required in total for the 15 rows? (a) 128128 (b) 112112 (c) 120120 (d) 135135

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