The terms (where ) are written in order

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

Problem

The terms

3k, 5k, 7k, 9k

(where

k \neq 0

) are written in order. Does this sequence form an AP, and if so, what is its common difference? (a) No; the common difference depends on

k

(b) Yes; common difference

k

2k

(d) No; the sequence is geometric, not arithmetic