An arithmetic sequence has first term a and common difference d. The sum of the first 20
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An arithmetic sequence has first term a and common difference d. The sum of the first 20 terms is seven times the sum of the first five terms.
a. Find d in terms of a.
b. Find the 65th term in terms of a.
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a Let S20 be the sum of the first 20 terms and S5 ...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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