The first term of an arithmetic progression is 5 and its common difference is 3

MATHEMATICS · Single correct · A Level · Mathematics · Sequences and series · Sequences and series

Problem

The first term of an arithmetic progression is 5 and its common difference is 3. If the sum of the first

n

terms equals 440, find

n

. (a) 17 (b) 16 (c) 11 (d) 15