Math

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Q: Determine the sum of the first seven terms of a geometric series in which the first term is 11 and the seventh term is 704.

^Are there two answers, since the common ratio could be positive or negative?

  • Math -

    The ratio between successive terms is
    (704/11)^(1/6) = 2 (or -2)

    Yes, two answers are possible.

    One series would be

    11, 22, 44, 88, 176, 352, 704

    and the other
    11, -22, 44, -88, 176, -352, 704

    You do the adding

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