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28 October, 11:53

Find the sum of the geometric series - 3,15,-75,375 when there are 9 terms and select the correct answer below

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  1. 28 October, 15:34
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    The sum to nterms:

    Sn=a (r^n - 1) / (r-1)

    r=15/-3=-5

    a=-3

    Sn=-3 (-5⁹ - 1) / (-5-1) = - 976563

    Answer; - 976563
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