3.a.2 - 2015 Q5 Answers
(i) All the terms of a geometric series are positive. The sum of the first two terms is 34 and the sum to infinity is 162
Find:
(a) the common ratio, (4)
(b) the first term. (2)
(ii) A different geometric series has a first term of 42 and a common ratio of 6/7 .
Find the smallest value of n for which the sum of the first n terms of the series exceeds 290 (4)
Find:
(a) the common ratio, (4)
(b) the first term. (2)
(ii) A different geometric series has a first term of 42 and a common ratio of 6/7 .
Find the smallest value of n for which the sum of the first n terms of the series exceeds 290 (4)