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14 December, 17:00

What is the sum of the first five terms of the geometric sequence in which a1=10 and r=1/2?

(Express your answer as an improper fraction using the slash (/) key and no spaces.)

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  1. 14 December, 20:32
    0
    (10 (1 - (1/2) ^5) / 1 - (1/2) =

    20 (1-1/32)

    =155/8
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