An arithmetic progression has first term a and common difference d. Give that the sum of the
Question:
An arithmetic progression has first term a and common difference d. Give that the sum of the first 100 terms is 25 times the sum of the first 20 terms.
a. Find d in term of a.
b. Write down an expression, in term of a, for the 50th term.
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a To find d in terms of a we can use the fact that the sum of t...View the full answer
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Related Book For 
Cambridge IGCSE And O Level Additional Mathematics Coursebook
ISBN: 9781108411660
2nd Edition
Authors: Sue Pemberton
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