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If the fifth term of a geometric sequence is 81 and the common ratio is 3/4, find the sum of the first 20 terms?

Science & Mathematics by Anonymous 2018-06-21 23:33:13

Social Science

If the fifth term of a geometric sequence is 81 and the common ratio is 3/4, find the sum of the first 20 terms?

1 answer

  • Anonymous

    81 = a (3/4)^4 81 = 27 a / 256 81 x 256 / 27 = a 768 = a

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