State the formula for the sum of the first terms of an arithmetic progression in

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

Problem

State the formula for the sum

S_n

of the first

n

terms of an arithmetic progression in (a) terms of its first term

a

and common difference

d

, and (b) terms of its first term

a

and last term

l