Find all School-related info fast with the new School-Specific MBA Forum

It is currently 21 Sep 2014, 08:20

Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

Is x a negative number? (1) x2 is a positive number. (2) x

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Manager
Manager
avatar
Joined: 10 May 2009
Posts: 68
Followers: 1

Kudos [?]: 9 [0], given: 11

Is x a negative number? (1) x2 is a positive number. (2) x [#permalink] New post 31 May 2009, 06:23
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

100% (02:01) correct 0% (00:00) wrong based on 1 sessions
Is x a negative number?

(1) x2 is a positive number.

(2) x · |y| is not a positive number.


Please discuss.
Manager
Manager
User avatar
Joined: 08 Feb 2009
Posts: 147
Schools: Anderson
Followers: 3

Kudos [?]: 32 [0], given: 3

Re: Tricky DS [#permalink] New post 31 May 2009, 07:22
I think the answer is C, assuming statement 1 refers to x^2

(1) \Rightarrow x = \pm

(2) If x = -ve, then x . |y| = Not Positive \Rightarrow x = -ve
If x = 0, then x. |y| = Not Positive \Rightarrow x = Not -ve.

Combining both the statements,

x = -ve.
Manager
Manager
avatar
Joined: 10 May 2009
Posts: 68
Followers: 1

Kudos [?]: 9 [0], given: 11

Re: Tricky DS [#permalink] New post 31 May 2009, 07:59
Even I marked it as C but the OA is E.

REally not sure why.. Manhattan provided OA as E

goldeneagle94 wrote:
I think the answer is C, assuming statement 1 refers to x^2

(1) \Rightarrow x = \pm

(2) If x = -ve, then x . |y| = Not Positive \Rightarrow x = -ve
If x = 0, then x. |y| = Not Positive \Rightarrow x = Not -ve.

Combining both the statements,

x = -ve.
Manager
Manager
User avatar
Joined: 08 Feb 2009
Posts: 147
Schools: Anderson
Followers: 3

Kudos [?]: 32 [0], given: 3

Re: Tricky DS [#permalink] New post 31 May 2009, 08:41
prinits wrote:
Even I marked it as C but the OA is E.

REally not sure why.. Manhattan provided OA as E

goldeneagle94 wrote:
I think the answer is C, assuming statement 1 refers to x^2

(1) \Rightarrow x = \pm

(2) If x = -ve, then x . |y| = Not Positive \Rightarrow x = -ve
If x = 0, then x. |y| = Not Positive \Rightarrow x = Not -ve.

Combining both the statements,

x = -ve.



Answer can be E only if we consider the possibility that y = 0.
Manager
Manager
avatar
Joined: 28 Jan 2004
Posts: 204
Location: India
Followers: 2

Kudos [?]: 10 [0], given: 4

GMAT Tests User
Re: Tricky DS [#permalink] New post 31 May 2009, 08:49
Stmt 1 - Tells us that X is either -ve or +ve.
Stmt 2 - Tells us that X is either -ve or 0.
By combining the 2 stmt. we can only negate that X is not positive (due to stmt b) however still it can be -ve or 0.
Hence E.
Manager
Manager
User avatar
Joined: 08 Feb 2009
Posts: 147
Schools: Anderson
Followers: 3

Kudos [?]: 32 [0], given: 3

Re: Tricky DS [#permalink] New post 31 May 2009, 08:56
mdfrahim wrote:
Stmt 1 - Tells us that X is either -ve or +ve.
Stmt 2 - Tells us that X is either -ve or 0.
By combining the 2 stmt. we can only negate that X is not positive (due to stmt b) however still it can be -ve or 0.
Hence E.


Why can't we negate that X is not equal to 0.
Manager
Manager
avatar
Joined: 28 Jan 2004
Posts: 204
Location: India
Followers: 2

Kudos [?]: 10 [0], given: 4

GMAT Tests User
Re: Tricky DS [#permalink] New post 01 Jun 2009, 19:19
Thx. goldeneagle94 for pointing a mistake in my explanation.
I agree with you that option E is possible if we consider that y can be 0.And we had to consider that ?
Manager
Manager
User avatar
Joined: 08 Feb 2009
Posts: 147
Schools: Anderson
Followers: 3

Kudos [?]: 32 [0], given: 3

Re: Tricky DS [#permalink] New post 02 Jun 2009, 03:39
mdfrahim wrote:
Thx. goldeneagle94 for pointing a mistake in my explanation.
I agree with you that option E is possible if we consider that y can be 0.And we had to consider that ?



I am not completely sure if we can consider a |y| to be 0.
Senior Manager
Senior Manager
User avatar
Joined: 15 Jan 2008
Posts: 295
Followers: 2

Kudos [?]: 22 [0], given: 3

GMAT Tests User
Re: Tricky DS [#permalink] New post 03 Jun 2009, 23:49
Why not .??

|Y| when equated to Zero, the value of X varies..

hence IMO the answer shud be E.
Senior Manager
Senior Manager
avatar
Joined: 16 Apr 2009
Posts: 251
Schools: Ross
Followers: 1

Kudos [?]: 23 [0], given: 10

GMAT Tests User
Re: Tricky DS [#permalink] New post 06 Jun 2009, 15:50
Quote:
Why not .??

|Y| when equated to Zero, the value of X varies..

hence IMO the answer shud be E.


can 0 be considered positive number?
Quote:
Is x a negative number?

(1) x2 is a positive number.

(2) x · |y| is not a positive number.


Stat 1 and 2
As x2 is a positive number and x.|y| is not a positive number - x should be a negative number?

I think the answer should be C. correct me if I am wrong..
_________________

Keep trying no matter how hard it seems, it will get easier.

Manager
Manager
avatar
Joined: 11 Aug 2008
Posts: 162
Followers: 1

Kudos [?]: 36 [0], given: 8

GMAT Tests User
Re: Tricky DS [#permalink] New post 08 Jun 2009, 19:12
I have a mistake when ignore y. Yes y can be 0 and from 2) x can be +ve, 0 or -ve
With 1) x can be +ve or -ve
together x can be +ve or -ve, not suf
Hence E
Director
Director
avatar
Joined: 23 May 2008
Posts: 840
Followers: 3

Kudos [?]: 27 [0], given: 0

GMAT Tests User
Re: Tricky DS [#permalink] New post 08 Jun 2009, 19:46
prinits wrote:
Is x a negative number?

(1) x2 is a positive number.

(2) x · |y| is not a positive number.


Please discuss.


1)x^2 positive

insuff could be - or+

2) x-|y| negative
x<|y|

x could be 4 and |y| could be 5 or x could be -4 and |y|could be 5

insuff

together no added info

E
1 KUDOS received
Manager
Manager
User avatar
Joined: 13 May 2009
Posts: 195
Schools: Stanford, Harvard, Berkeley, INSEAD
Followers: 4

Kudos [?]: 27 [1] , given: 1

GMAT Tests User
Re: Tricky DS [#permalink] New post 08 Jun 2009, 20:10
1
This post received
KUDOS
prinits wrote:
Is x a negative number?

(1) x2 is a positive number.

(2) x · |y| is not a positive number.


Please discuss.


Remember, 0 is neither positive nor negative on the GMAT (but it is even).

(1) x^{2} > 0
\longrightarrow x<0 OR x>0
INSUFFICIENT

(2) x|y| \leq 0
\longrightarrow y=0 or x \leq 0
INSUFFICIENT

(1&2) either y=0 & x>0 or x<0

Final Answer, E.
_________________

Hades

Re: Tricky DS   [#permalink] 08 Jun 2009, 20:10
    Similar topics Author Replies Last post
Similar
Topics:
2 In the sequence of positive numbers x_1 , x_2 , x_3 ,... Vyacheslav 4 10 Jan 2010, 13:43
In the sequence of positive numbers x_1, x_2, x_3 what vaivish1723 1 12 Jun 2009, 22:27
1 Is X a negative number? statement 1: x^2 is a positive bandit 7 15 Mar 2009, 08:58
1 Is x a -ve number? (1) x^2 (squared) is a positive number. Fistail 4 30 Apr 2008, 20:50
4 Experts publish their posts in the topic In the sequence of positive numbers x1, x2, x3, ..., what M8 7 14 May 2006, 04:20
Display posts from previous: Sort by

Is x a negative number? (1) x2 is a positive number. (2) x

  Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Privacy Policy| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group and phpBB SEO

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.