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# Is X a negative number? statement 1: x^2 is a positive

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Manager
Joined: 22 Feb 2009
Posts: 134
Schools: Kellogg (R1 Dinged),Cornell (R2), Emory(Interview Scheduled), IESE (R1 Interviewed), ISB (Interviewed), LBS (R2), Vanderbilt (R3 Interviewed)
Is X a negative number? statement 1: x^2 is a positive [#permalink]

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15 Mar 2009, 09:58
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Is X a negative number?

statement 1: x^2 is a positive number
statement 2: x*lyl is not a positive number

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
Director
Joined: 04 Jan 2008
Posts: 860

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15 Mar 2009, 11:23
(1)--->x=+ve or -ve number(Any number even decimal)-INSUFF
(2)--->x could be 0 or Negative Number--INSUFF
Combining we get x-->Negative Number--SUFF
IMO C
bandit wrote:
Is X a negative number?

statement 1: x^2 is a positive number
statement 2: x*lyl is not a positive number

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Manager
Joined: 22 Feb 2009
Posts: 134
Schools: Kellogg (R1 Dinged),Cornell (R2), Emory(Interview Scheduled), IESE (R1 Interviewed), ISB (Interviewed), LBS (R2), Vanderbilt (R3 Interviewed)

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15 Mar 2009, 12:02
1
KUDOS
nitya34 wrote:
(1)--->x=+ve or -ve number(Any number even decimal)-INSUFF
(2)--->x could be 0 or Negative Number--INSUFF
Combining we get x-->Negative Number--SUFF
IMO C
bandit wrote:
Is X a negative number?

statement 1: x^2 is a positive number
statement 2: x*lyl is not a positive number

I thought so ... but its not the OA. Its E.... Can any one explain?
Director
Joined: 04 Jan 2008
Posts: 860

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15 Mar 2009, 12:13
OA could be wrong also
whats the source?I have seen this Q,somewhere
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Manager
Joined: 22 Feb 2009
Posts: 134
Schools: Kellogg (R1 Dinged),Cornell (R2), Emory(Interview Scheduled), IESE (R1 Interviewed), ISB (Interviewed), LBS (R2), Vanderbilt (R3 Interviewed)

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15 Mar 2009, 20:39
well I think the OA is correct. because, even if you combine (1) and (2), the 2nd statement can be -ve or 0 ( (lyl) can be 0, isn't it?). Therefore E
Manager
Joined: 02 Mar 2009
Posts: 129

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15 Mar 2009, 23:01
I got C too.

If we combine both of them, we know that x has to be a number other than 0 becuase the first statemetn says x^2 is positive. It cannot be 0. The second statement tells us that it is 0 or negative. Combining both tells us that x is negative.

Which book is the question from?
Senior Manager
Joined: 12 Mar 2009
Posts: 306

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16 Mar 2009, 06:28
Is X a negative number?

statement 1: x^2 is a positive number
statement 2: x*lyl is not a positive number

Statement A: cant answer as X can be +ve or -ve.
Statement B: x* mod y is not a positive number. That means it can be either -ve or 0.
Then, mod y can be,
1. -ve (it cant be as it is mod)
2. 0

x can be:
1. -ve
2. 0

We can not find the ans even using the above statements, hence E. Hope this helps.
Director
Joined: 04 Jan 2008
Posts: 860

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16 Mar 2009, 09:30
vaivish1723 wrote:
Is X a negative number?

statement 1: x^2 is a positive number
statement 2: x*lyl is not a positive number

Statement A: cant answer as X can be +ve or -ve.---OKAYStatement B: x* mod y is not a positive number. That means it can be either -ve or 0.
Then, mod y can be,
1. -ve (it cant be as it is mod)-->YOU MEAN +VE as MODULUS can only be +VE
2. 0

x can be:
1. -ve(HOW?)2. 0

We can not find the ans even using the above statements, hence E. Hope this helps.

How?Because x can ONLY be +VE

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Re: DS question..   [#permalink] 16 Mar 2009, 09:30
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