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Indices Problem

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Indices Problem

by driekus » Sun Aug 29, 2010 11:10 am
I came across this problem in the GMAT practice test (official one) and Im wondering why I got it wrong.

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

I got an answer of 2^5.
Official answer is 2^8
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by niksworth » Sun Aug 29, 2010 11:17 am
2^(4-1)^2 = 2^3^2 = 2^9

2^(3-2) = 2^1 = 2

Therefore, (2^(4-1)^2)(2^(3-2) = 2^9/2 = 2^8.
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by driekus » Sun Aug 29, 2010 11:20 am
Wow, I really missed the point on that one. :)
Thanks for the help, greatly appreciated.
Peter
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by diebeatsthegmat » Sun Aug 29, 2010 11:20 am
driekus wrote:I came across this problem in the GMAT practice test (official one) and Im wondering why I got it wrong.

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

I got an answer of 2^5.
Official answer is 2^8
lol
2^(4-1)^2=2^3^2=2^9
2^(3-2)=2^1
2^9/2^1=2^(9-1)=2^8
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by driekus » Sun Aug 29, 2010 11:22 am
The even scarier thing is that I got a 49 scaled score on the quantitative section. :)
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