a. A geometric progression has first term a, common ratio r and sum to infinity S. A
Question:
a. A geometric progression has first term a, common ratio r and sum to infinity S.
A second geometric progression has first term 5a, common ratio 3r and sum to infinity 10S.
Find the value of r.
b. An arithmetic progression has first term −4. The nth term is 8 and the (2n)th term is 20.8.
Find the value of n.
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a We know that the sum of an infinite geometric progression with first term a and common ratio r is ...View the full answer
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Related Book For 
Cambridge International AS And A Level Mathematics Pure Mathematics 1 Coursebook
ISBN: 9781108407144
1st Edition
Authors: Sue Pemberton, Julian Gilbey
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