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If x<y, which of the following must be true? I.

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If x<y, which of the following must be true? I. [#permalink] New post 22 Jul 2008, 05:16
If x<y, which of the following must be true?
I. |x|<|y|
II. x-y<0
III. x2-y2<0
A. I only
B. II only
C. III only
D. I and II
E. II and III
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Re: INEQUALITY GMAT PREP [#permalink] New post 22 Jul 2008, 05:20
Answer is (B)

I. does not work since x=-2 and y=-1 verify x<y but not |x|<|y|

III. does not work since x=-2 and y=-1 verify x<y but not x^2-y^2<0
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Re: INEQUALITY GMAT PREP [#permalink] New post 22 Jul 2008, 06:03
III. x2-y2<0

Is this supposed to be x^2 - y^2 < 0 ? or 2x - 2x < 0?
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Re: INEQUALITY GMAT PREP [#permalink] New post 22 Jul 2008, 07:51
I & III do not satisfy negative numbers.
B.
Re: INEQUALITY GMAT PREP   [#permalink] 22 Jul 2008, 07:51
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If x<y, which of the following must be true? I.

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