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8 November, 20:41

Use the formula to evaluate the series 3-9 + 27 - 81 + ... - as.

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  1. 8 November, 20:51
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    Step-by-step explanation:

    the formula for the series is

    (3) ⁿ (-1) ⁿ+¹

    where

    n=1,2,3, ...
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