The sum of the first 12 terms of an arithmetic progression is 300

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

Problem

The sum of the first 12 terms of an arithmetic progression is 300, while the sum of the next 8 terms (that is, from the 13th to the 20th terms) is 520. Find the first term and the common difference of the progression.

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