Find the first term of an arithmetic progression whose sum of the first 12 terms is…

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

Problem

Find the first term of an arithmetic progression whose sum of the first 12 terms is 186 and whose common difference is 5. (a)

-24

(b)

-6

(c)

-12

(d)

15.5