Posted by Elom Charles on Friday, February 17, 2012 at 10:37am.
ar = a+12
r = a/2
a^2/2 = a+12
a^2 - 2a - 24 = 0
(a-6)(a+4)
so, a=6, r=3
or, a=-4, r=-2
6, 18, 54, 162, ...
or
-4, 8, -16, 32, ...
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