A geometric progression has first term and common ratio
MATHEMATICS · Single correct · A Level · Mathematics · Sequences and series · Sequences and series
Problem
A geometric progression has first term 2 and common ratio −0.4. Calculate, correct to one decimal place, the percentage error when the sum of the first three terms is used to approximate the sum to infinity.
(a) 9.1\%
(b) 4.6\%
(c) 6.4\%
(d) 12.8\%