Two arithmetic progressions have first terms 4 and 1 respectively
MATHEMATICS · Single correct · A Level · Mathematics · Sequences and series · Sequences and series
Problem
Two arithmetic progressions have first terms 4 and 1 respectively. The common difference of the first progression is 6. If the sums of the first four terms of both progressions are equal, what is the common difference of the second progression?
(a) 9
(b) 6
(c) 8
(d) 7