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2 January, 14:16

Find the sum of the first 25 terms of a geometric sequence where the first term is 177,147 and the common ratio is - 1/3

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  1. 2 January, 14:57
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    132860 to nearest whole number.

    Step-by-step explanation:

    Sum of n terms = a1. (r^n - 1) / (r - 1).

    S25 = 177,147 ((-1/3) ^25 - 1) / (-1/3 - 1)

    = 177,147 * - 1 / - 4/3

    = 132860.
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