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Source: — Problem Solving |

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by Anurag@Gurome » Sun Jun 19, 2011 2:10 am
r = 1 + 2xy + x²y² = (xy + 1)²

Statement 1: r = (xy + 1)² = 0 --> xy = -1

Sufficient

Statement 2: Value of xy doesn't depend on the value of x only.

Not sufficient

The correct answer is A.
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by amit2k9 » Sun Jun 19, 2011 3:53 am
(xy+1)^2 = r

a r=0 = (xy+1)^2

xy= -1 sufficient.

b x>0 y can have any value. Not sufficient.
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