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

It is currently 30 Aug 2014, 16:48

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

DS = Modulus

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Director
Director
avatar
Joined: 12 Oct 2008
Posts: 558
Followers: 2

Kudos [?]: 59 [0], given: 2

GMAT Tests User
DS = Modulus [#permalink] New post 19 Sep 2009, 12:31
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 100% (00:22) wrong based on 0 sessions
what is the value of |x|

1. x = - |x|
2. x^2 = 4

Please explain
[Reveal] Spoiler:
OA B IMO D
Intern
Intern
avatar
Joined: 20 Aug 2009
Posts: 11
Followers: 0

Kudos [?]: 1 [0], given: 11

Re: DS = Modulus [#permalink] New post 19 Sep 2009, 12:38
Answer would be B (2) alone is sufficient.

1. x = - |x| that means x < 0 ..insufficient..for example lets say x=-2 , then |x| = 2 so in order for the condition to match x has to be negative. this will not work for x = 2

2. x square = 4. i.e x= 2 or x = -2 but |x| = 2 ...sufficient..
Intern
Intern
avatar
Joined: 03 Sep 2009
Posts: 30
Followers: 0

Kudos [?]: 7 [0], given: 1

Re: DS = Modulus [#permalink] New post 19 Sep 2009, 12:42
Agree with your solution. Ans: B

keys wrote:
Answer would be B (2) alone is sufficient.

1. x = - |x| that means x < 0 ..insufficient..for example lets say x=-2 , then |x| = 2 so in order for the condition to match x has to be negative. this will not work for x = 2

2. x square = 4. i.e x= 2 or x = -2 but |x| = 2 ...sufficient..
Director
Director
avatar
Joined: 12 Oct 2008
Posts: 558
Followers: 2

Kudos [?]: 59 [0], given: 2

GMAT Tests User
Re: DS = Modulus [#permalink] New post 19 Sep 2009, 12:44
OA is B

my thinking is x = -|x|

|x| will always +ve it means x = -x only 0 can satisfy this condition, therefore x = 0

what is wrong here?

keys wrote:
Whats OA?
Intern
Intern
avatar
Joined: 03 Sep 2009
Posts: 30
Followers: 0

Kudos [?]: 7 [0], given: 1

Re: DS = Modulus [#permalink] New post 19 Sep 2009, 12:51
|x| >= 0 with all x
but |x| = x only with x >=0
so when you say "it means x = -x " you only think about x>=0 and you forgot the case x <0.
when x <0 => |x| = -x with all x <=0

reply2spg wrote:
OA is B

my thinking is x = -|x|

|x| will always +ve it means x = -x only 0 can satisfy this condition, therefore x = 0

what is wrong here?

keys wrote:
Whats OA?
Manager
Manager
avatar
Joined: 15 Sep 2009
Posts: 139
Followers: 1

Kudos [?]: 15 [0], given: 2

Re: DS = Modulus [#permalink] New post 20 Sep 2009, 03:32
statement 1 is insuff

statement 2 : x can be either 2 or -2. So |x| = 2.suff


I wud go with option 2
Re: DS = Modulus   [#permalink] 20 Sep 2009, 03:32
    Similar topics Author Replies Last post
Similar
Topics:
Experts publish their posts in the topic DS inequalities and Modulus pnf619 3 02 Sep 2012, 02:52
Experts publish their posts in the topic MODULUS GMATPASSION 3 14 Mar 2012, 17:45
Experts publish their posts in the topic DS-Modulus mojorising800 2 05 Jul 2011, 01:46
Modulus reply2spg 4 28 Oct 2009, 15:40
Modulus DS rbcola 3 14 Jul 2006, 14:45
Display posts from previous: Sort by

DS = Modulus

  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®.