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Source: — Problem Solving |

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by Brent@GMATPrepNow » Sat Sep 29, 2012 4:27 pm
grandh01 wrote:Of the following, which is greatest?

1) (1/5)^-2
2) (1/3)^-2
3) 3^-2
4) 5^-2
5) 2^3

OA IS A
For A and B, we can use the nice rule that says (a/b)^-n = (b/a)^n
1) (1/5)^-2 = (5/1)^2 = 25
2) (1/3)^-2 = (3/1)^2 = 9
3) 3^-2 = 1/(3^2) = 1/9
4) 5^-2 = 1/(5^2) = 1/25
5) 2^3 = 8

Answer = A

Cheers,
Brent
Brent Hanneson - Creator of GMATPrepNow.com
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