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Insert three geometric means between 1 and 81.

  • maths -

    1 , r , r^2 , r^3 , 81

    so r/1 = 81/r^3
    r^4 = 81
    r = ± 3

    the 3 geometric means could be

    3, 9 , and 27
    or
    -3 , 9, and -27

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