The first term of a geometric series is 30. The sum to infinity of the series is

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The first term of a geometric series is 30. The sum to infinity of the series is 240.

a. Show that the common ratio, r, is 7/8.

b. Find to 3 significant figures, the difference between the 4th and 5th terms.

c. Calculate the sum of the first 4 terms, giving your answer to 3 significant figures. The sum of the first n terms of the series is greater than 180.

d. Calculate the smallest possible value of n.

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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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Question Posted: Aug 08, 2023 07:58 AM

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The first term of a geometric series is 30. The sum to infinity of the series is

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Pearson Edexcel A Level Mathematics Pure Mathematics Year 2

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