Posted by ELIJAH HAVA on Sunday, April 28, 2013 at 2:27am.
Insert three geometric means between 1 and 81.

maths  Reiny, Sunday, April 28, 2013 at 5:49am
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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