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23 May, 19:02

Find r for the geometric series with s5 = 484, a1 = 4, a5 = 324

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  1. 23 May, 22:05
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    A5 / a1 = r^4 = 324/4

    So r^4 = 81

    r = + / - 3

    If r = 3 : -

    S5 = 4 * (3^5-1) / (3-1) = 484

    so r = 3 Answer
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