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3.a.3 - 2014 Q6 Answers

The first term of a geometric series is 20 and the common ratio is 7/8.

The sum to infinity of the series is S∞

’ (a) Find the value of S’∞. (2)

The sum to N terms of the series is SN

(b) Find, to 1 decimal place, the value of S12. (2)

(c) Find the smallest value of N, for which: (4)
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