# maths

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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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