The sum of the first terms of an arithmetic progression is given by

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

Problem

The sum of the first

n

terms of an arithmetic progression is given by

S_n = 3n^2 + 2n

. (a) Find its

n

th term

t_n

. (b) Determine its common difference.