MATHEMATICS · Single correct · A Level · Mathematics · Sequences and series · Sequences and series
Problem
In an arithmetic progression, the 6th term is 20 while the sum of the first 6 terms is 75. Which of the following ordered pairs (a, d) represents the first term and the common difference of the progression?
(a) (8,1)
(b) (5,3)
(c) (4,4)
(d) (6,2)