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13 December, 14:03

Use the formula to evaluate the series - 3+6-12+24 - ... - a7

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  1. 13 December, 14:22
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    If the question is asking for a7, the answer is - 192.

    The common ratio, r, is found by dividing from right to left.

    24/-12 = - 2

    -12/6 = - 2

    r = - 2

    To continue the series multiply by - 2.

    24*-2 = - 48

    -48*-2=96

    96*-2=-192
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