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by mariah » Sun Nov 29, 2009 4:37 am
Is x > y?
1) x^2 > y^2
2) y - y^2 > 0

oa E
i agree with oa but i don't agree we explanation..

explanation : From II, we cannot determine if Y is positive or not.

how negative number can satisfy second statement ?... i don't get that ...pls explain
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by scoobydooby » Sun Nov 29, 2009 9:40 am
i guess stmnt 2 is insufficient as it doesnt mention x, so we cant answer the question: is x>y
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by Brent@GMATPrepNow » Sun Nov 29, 2009 9:55 am
mariah wrote:Is x > y?
1) x^2 > y^2
2) y - y^2 > 0

oa E
i agree with oa but i don't agree we explanation..

explanation : From II, we cannot determine if Y is positive or not.

how negative number can satisfy second statement ?... i don't get that ...pls explain
You're right.
Statement II definitely tells us that y is positive.
y - y^2 > 0 (first add y^2 to both sides)
y>y^2
Since y^2 must be greater than or equal to 0, we now know that y must be greater than or equal to 0 (i.e., y is positive)
Brent Hanneson - Creator of GMATPrepNow.com
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