A geometric series has first term a and common ratio r. The second term of the series
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A geometric series has first term a and common ratio r. The second term of the series is 11/8 and the sum to infinity of the series is 8.
a. Show that 64r2 − 64r + 15 = 0.
b. Find the two possible values of r.
c. Find the corresponding two possible values of a. Given that r takes the smaller of its two possible values,
d. Find the smallest value of n for which Sn exceeds 7.99.
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Related Book For
Pearson Edexcel A Level Mathematics Pure Mathematics Year 2
ISBN: 9781292183404
1st Edition
Authors: Greg Attwood, Jack Barraclough, Ian Bettison, David Goldberg, Alistair Macpherson, Joe Petran
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