In an arithmetic progression

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

Problem

In an arithmetic progression, the first term equals the

n

th term. What is the sum of the first

n

terms? (a)

2na

(b)

\dfrac{n}{2}a

(c)

na

(d)

\dfrac{n(n+1)}{2}a