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caramel3536
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 Posted: Sat Jul 19, 2008 10:25 am Post subject: GMATPrep Arithmetic |
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If R = 1 + 2xy +x(squared)y(squared)
What is the value of xy
(1) R = 0
(2) x>0
Ans = A |
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parallel_chase
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| Posted: Sat Jul 19, 2008 4:15 pm Post subject: Re: GMATPrep Arithmetic |
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| caramel3536 wrote: | If R = 1 + 2xy +x(squared)y(squared)
What is the value of xy
(1) R = 0
(2) x>0
Ans = A |
The answer is indeed A
R=1+2xy+x^2y^2 => (1+xy)^2
Statement I
R=0, therefore (1+xy)^2=0
xy=-1
Statement II
x>0
It does not gives us any specific value of x or y or R
Not Sufficient.
Hence A. |
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caramel3536
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| Posted: Sun Jul 20, 2008 7:44 pm Post subject: |
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