Two arithmetic progressions are given as follows: AP 1 : 7, 11, 15, ..

MATHEMATICS · Subjective · CBSE · Mathematics · Arithmetic Progressions · Arithmetic Progressions

Problem

Two arithmetic progressions are given as follows: AP 1 : 7, 11, 15, ... AP 2 : 3, 9, 15, ... Determine the positive integer n for which the sum of the first n terms of the two progressions is equal.

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