The 5th to the 15th terms (both inclusive) of an AP are to be added

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

Problem

The 5th to the 15th terms (both inclusive) of an AP are to be added. If the AP is

3,7,11,\dotsc

, what is the required sum? (a) 451 (b) 429 (c) 390 (d) 465