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GMAT Prep Data Sufficiency Question

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Source: — Data Sufficiency |
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by jayhawk2001 » Sun Jun 17, 2007 7:17 pm
(x^2 + y^2 + 2xy) / (x^2 + y^2 - 2xy)

1 - sufficient. 5xy / xy = 5. So, we know the value.

2 - insufficient. Just knowing xy will not help.

Hence A
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