Find the partial sum S_n for a geometric series such that a_{4} = 216, a_{9} = 52488, and n = 10.

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  1. I assume that a_{n} ios the nth term of the series.

    The ratio of successive terms is 3, since
    (52488/216)^(1/5) = 3

    a_{n} = (216/81)* 3^n

    Add up the first 10 terms for the partial sum S_n

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