In an arithmetic progression five consecutive terms are written as

MATHEMATICS · Single correct · AoPS · Mathematics · Sequences & Series · Sequences & Series

Problem

\_,\,15,\_,\_,30

. Which of the following lists gives the three missing terms in their correct order? (a)

12,\,18,\,24

(b)

10,\,20,\,25

(c)

11,\,19,\,23

(d)

10,\,25,\,20