The sum of the first 10 terms of an arithmetic progression is 145 and its common…

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

Problem

The sum of the first 10 terms of an arithmetic progression is 145 and its common difference is 3. Find the first term. (a)

2

(b)

1

(c)

-\tfrac12

(d)

-1