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by bomond » Fri Aug 29, 2008 6:06 am
OA is right.

We know that 3^(x-1)=(3^x)/3

Then equation looks like this:

(3^x)-(3^x)/3=162
3*(3^x)-(3^x)=3*162
2*(3^x)=3*162
(3^x)=3*81
(3^x)=3^5
x=5

Then x(x-1)=5*4=20
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