The terms of the arithmetic progression 20, 18, 16

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

Problem

The terms of the arithmetic progression 20, 18, 16,

\dots

are added in order. What is the least number of terms that must be taken so that the sum of the terms equals 104? (a) 7 (b) 13 (c) 8 (d) 9