If the sum of the first terms of an arithmetic progression with first term 5 and…

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

Problem

If the sum of the first

n

terms of an arithmetic progression with first term 5 and common difference 5 is 390, the value of

n

is (a)

11

(b)

12

(c)

9

(d)

13