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Operations / Exponents

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Operations / Exponents

by Nena1982 » Sat Jul 19, 2008 7:02 am
Hi guys,

I just took the GMAT Preptest and got this question that I can't figure out at all:

If operation o is defined for all positive integers x and w by x o w = 2^x / 2^w, then (3 o 1) o 3 =

2
4
8
16
32

The correct answer is 2 (for "+" I guess). I'm not sure though why 32 (for "-") is not right...

I'm sure you guys are smarter than I... ;)

Truly appreciate your help!
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by pepeprepa » Sat Jul 19, 2008 7:40 am
Perhaps you read the equation in the wrong way, that's what I did.
The equation is just: x o w = 2^x / 2^w
It may be ok now:

3o1=(2^3)/2=4
(3o1)o3=4o3=(2^4)/(2^3)=2
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by Nena1982 » Sat Jul 19, 2008 7:51 am
Well, that makes sense... :oops: LOL

Thanks a lot!
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