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Is |x - 1| < 1 ? 1. (x - 1)^2 <= 1 2. x^2 - 1

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Senior Manager
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Is |x - 1| < 1 ? 1. (x - 1)^2 <= 1 2. x^2 - 1 [#permalink]

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23 Mar 2008, 13:00
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Is $$|x - 1| < 1$$ ?

1. $$(x - 1)^2 <= 1$$
2. $$x^2 - 1 > 0$$
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Kudos [?]: 111 [0], given: 0

CEO
Joined: 17 Nov 2007
Posts: 3584

Kudos [?]: 4575 [0], given: 360

Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
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23 Mar 2008, 13:11
E

$$|x - 1| < 1$$ --> is x (0,2)

1. $$(x - 1)^2 <= 1$$ --> x e [0,2]. insufficient
2. $$x^2 - 1 > 0$$ --> x e (-∞,1)&(1,+∞). insufficient
1&2 x e (1,2]. insufficient.
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Senior Manager
Joined: 20 Dec 2004
Posts: 252

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23 Mar 2008, 13:20
walker wrote:
E

$$|x - 1| < 1$$ --> is x (0,2)

1. $$(x - 1)^2 <= 1$$ --> x e [0,2]. insufficient
2. $$x^2 - 1 > 0$$ --> x e (-∞,1)&(1,+∞). insufficient
1&2 x e (1,2]. insufficient.

I think I am loosing it ....

I was able to get exactly where you finished but then I argued that using 1&2 we know that x e (1,2]....meaning |x-1| will never be less than 1. And hence we can answer the question stem as a yes or no.....That is |x-1| is actually > 1

So why should it not be C ?
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23 Mar 2008, 13:28
neelesh wrote:
walker wrote:
E

$$|x - 1| < 1$$ --> is x (0,2)

1. $$(x - 1)^2 <= 1$$ --> x e [0,2]. insufficient
2. $$x^2 - 1 > 0$$ --> x e (-∞,1)&(1,+∞). insufficient
1&2 x e (1,2]. insufficient.

I think I am loosing it ....

I was able to get exactly where you finished but then I argued that using 1&2 we know that x e (1,2]....meaning |x-1| will never be less than 1. And hence we can answer the question stem as a yes or no.....That is |x-1| is actually > 1

So why should it not be C ?

Combining 1 & 2 we get x e (1,2] but this is still not sufficient since the question is really asking is x e (0,2). Picking 1.5 for instance leads to a "yes", while picking 2 leads to a "no".
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Kudos [?]: 3571 [0], given: 2

CEO
Joined: 17 Nov 2007
Posts: 3584

Kudos [?]: 4575 [0], given: 360

Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
GMAT 1: 750 Q50 V40

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23 Mar 2008, 13:30
neelesh wrote:
So why should it not be C ?

Because x=2 and x=1.5 satisfy both conditions, but the answers are "no" and "yes"
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Kudos [?]: 4575 [0], given: 360

CEO
Joined: 17 Nov 2007
Posts: 3584

Kudos [?]: 4575 [0], given: 360

Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
GMAT 1: 750 Q50 V40

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23 Mar 2008, 13:31
chineseburned, thanks. I did not see your post
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Senior Manager
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23 Mar 2008, 13:35
walker wrote:
neelesh wrote:
So why should it not be C ?

Because x=2 and x=1.5 satisfy both conditions, but the answers are "no" and "yes"

Thanks walker and chineseburned..

I think I need to take a break ....what a silly a@# mistake..... ....
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Re: DS   [#permalink] 23 Mar 2008, 13:35
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