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13 August, 19:27

Find the sum of a finite geometric sequence from n = 1 to n = 7, using the expression - 4 (6) ^n - 1.

a. 111,325

b. 526

c. 782

d. - 22,948

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  1. 13 August, 23:11
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    Now we know what the common ratio is, 6, and what the first term is, - 4,

    and our nth term is 7, since we're asked to do the sum

    from 1 to 7.

    S7 = - 4 (1-6 (7) / (1-6))

    =-223948
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