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Source: — Data Sufficiency |
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by Claret » Sun Jun 07, 2009 5:11 pm
Ans (A) ?
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by ssmiles08 » Sun Jun 07, 2009 5:17 pm
Yes I got (A) too.

It is really asking if x/y is an integer.

3Y^2 + 7Y = X

so Y(3Y+7)/Y = Integer? Yes

Choice 1 works.

choice 2 tells us that (X^2 - X)/Y = integer.

We can't be sure b/c X(X-1) = X^2 - X

either X can be divisible by Y or (X-1) can be divisible by Y or both X and (X-1) are divisible by Y
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by houstonrockets16 » Sun Jun 07, 2009 5:53 pm
A is the answer. Thanks a lot
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