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# Is x-y+1 greater than x+y-1 ? (1) x > 0 (2) y < 0

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Manager
Joined: 30 May 2010
Posts: 190
Is x-y+1 greater than x+y-1 ? (1) x > 0 (2) y < 0 [#permalink]

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18 Aug 2010, 00:30
00:00

Difficulty:

25% (medium)

Question Stats:

78% (01:39) correct 22% (00:23) wrong based on 27 sessions

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Is $$x-y+1$$ greater than $$x+y-1$$?

(1) $$x > 0$$

(2) $$y < 0$$
[Reveal] Spoiler: OA
Manager
Joined: 30 May 2010
Posts: 190
Re: Inequalities problem GMATPrep x-y+1>x+y-1? [#permalink]

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18 Aug 2010, 00:34
First simplify:

$$x+1>x+2y-1$$ ?

$$x>x+2y-2$$ ?

$$0>2y-2$$ ?

$$0>2(y-1)$$ ?

$$0>y-1$$ ?

Finally, is $$y < 1$$ ?

(1) Insufficient, nothing given about y.
(2) Sufficient, $$y<0$$ so it must be less than 1.
Manager
Joined: 24 Dec 2009
Posts: 219
Re: Inequalities problem GMATPrep x-y+1>x+y-1? [#permalink]

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18 Aug 2010, 14:10
x - y + 1 > x + y - 1

simplified version - y < 1 ?

A - not sufficient
B - y < 0 hence it has to be less than 1.
B sufficient.

Thanks,
Akhil M.Parekh
Re: Inequalities problem GMATPrep x-y+1>x+y-1?   [#permalink] 18 Aug 2010, 14:10
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