Last visit was: 20 May 2024, 07:17 It is currently 20 May 2024, 07:17
Decision Tracker
My Rewards
Unanswered
Active Topics
New posts
New comers' posts
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.
Go to My Error Log Learn more
Close
Request Expert Reply
Confirm Cancel

Is |a|=b-c ? (1) a+c b (2) a<0

User avatar
lumone
Senior Manager
Senior Manager
Joined: 25 Nov 2006
Posts: 275
Own Kudos [?]: 235 [0]
Given Kudos: 0
Schools:St Gallen, Cambridge, HEC Montreal
 Q48  V39
Send PM
Is |a|=b-c ? (1) a+c b (2) a<0 [#permalink] Is |a|=b-c ? (1) a+c b (2) a<0   25 Jun 2008, 02:57
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 1 sessions
Hide Show timer Statistics
Is |a|=b-c ?

(1) a+c≠b

(2) a<0



Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Data Sufficiency (DS) Forum
Still interested in this question? Check out the "Best Topics" block below for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
User avatar
saurabhkowley18
Intern
Intern
Joined: 18 Feb 2008
Posts: 14
Own Kudos [?]: [0]
Given Kudos: 0
Send PM
Re: Is |a|=b-c ? (1) a+c b (2) a<0 [#permalink] Is |a|=b-c ? (1) a+c b (2) a<0   25 Jun 2008, 03:13
lumone wrote:
Is |a|=b-c ?

(1) a+c≠b

(2) a<0


I think the ans is A
Statement 1 is sufficient as the condition a+c not equal to b is possible only is a is negative.
Statement is insufficient as it gives no info about b and c
User avatar
Value
Intern
Intern
Joined: 13 Apr 2008
Posts: 38
Own Kudos [?]: 68 [0]
Given Kudos: 0
Send PM
Re: Is |a|=b-c ? (1) a+c b (2) a<0 [#permalink] Is |a|=b-c ? (1) a+c b (2) a<0   25 Jun 2008, 03:28
lumone wrote:
Is |a|=b-c ?

(1) a+c≠b

(2) a<0


I think its C.

1) a+c≠b but may be -a+c=b so not sufficient

2) a<0 insuffcient

Combine a+c≠b and -a+c≠b sufficient
User avatar
lumone
Senior Manager
Senior Manager
Joined: 25 Nov 2006
Posts: 275
Own Kudos [?]: 235 [0]
Given Kudos: 0
Schools:St Gallen, Cambridge, HEC Montreal
 Q48  V39
Send PM
Re: Is |a|=b-c ? (1) a+c b (2) a<0 [#permalink] Is |a|=b-c ? (1) a+c b (2) a<0   25 Jun 2008, 03:33
I see it this way:

|a|=b-c?
If a> 0, then the question is: a=b-c?
If a<0, then the question is: a=c-b?

(1) a+c≠b
a≠b-c
not sufficient, we need to know whether a>0 to answer that question.

(2)
a>0, but we don't know anything about the relationship between a,b and c

Together, A<0. Therefore the question is: Is a=c-b? And (1) does not tell us that.

My answer is therefore E: Problem the OA is C. :?

Either I am wrong or the OA is wrong. Would anyone know?
User avatar
Oski
Current Student
Joined: 12 Jun 2008
Posts: 116
Own Kudos [?]: 148 [0]
Given Kudos: 0
Concentration: General Management, Strategy
Schools:INSEAD Class of July '10
 Q50  V46
Send PM
Re: Is |a|=b-c ? (1) a+c b (2) a<0 [#permalink] Is |a|=b-c ? (1) a+c b (2) a<0   25 Jun 2008, 03:43
Answer is (E)

Statement (1) is insufficient since it just gives us a value a is not equal to: a≠b-c (but a could be anything else than b-c ! including c-b which could be negative or anything else)

Statement (2) is insufficient since it just gives us the sign of a: a<0 (but a could be any negative number! including -|b-c| and all the other negative numbers)

(1) and (2) are insufficient together too since a could be any negative number different than b-c (if b-c is ever negative, which we don't know and in which case |a|=b-c makes no sense).




But if (1) was a+b≠c, then we would have been able to answer the question (answer would have been (C))
User avatar
scthakur
Director
Director
Joined: 17 Jun 2008
Posts: 614
Own Kudos [?]: 444 [0]
Given Kudos: 0
Send PM
Re: Is |a|=b-c ? (1) a+c b (2) a<0 [#permalink] Is |a|=b-c ? (1) a+c b (2) a<0   25 Jun 2008, 05:06
I will go with E.

Stmt 1: a + c does not equal b. That means, a does not equal b-c.. Insufficient.

Stmt 2: a < 0. Insufficient.

Combining both, a can still not equal b-c. Insufficient.
User avatar
saurabhkowley18
Intern
Intern
Joined: 18 Feb 2008
Posts: 14
Own Kudos [?]: [0]
Given Kudos: 0
Send PM
Re: Is |a|=b-c ? (1) a+c b (2) a<0 [#permalink] Is |a|=b-c ? (1) a+c b (2) a<0   29 Jun 2008, 19:22
Oski wrote:
Answer is (E)

Statement (1) is insufficient since it just gives us a value a is not equal to: a≠b-c (but a could be anything else than b-c ! including c-b which could be negative or anything else)

Statement (2) is insufficient since it just gives us the sign of a: a<0 (but a could be any negative number! including -|b-c| and all the other negative numbers)

(1) and (2) are insufficient together too since a could be any negative number different than b-c (if b-c is ever negative, which we don't know and in which case |a|=b-c makes no sense).




But if (1) was a+b≠c, then we would have been able to answer the question (answer would have been (C))


Hi can you explain how a+b not equal to c is would ans the Q ?
User avatar
Oski
Current Student
Joined: 12 Jun 2008
Posts: 116
Own Kudos [?]: 148 [0]
Given Kudos: 0
Concentration: General Management, Strategy
Schools:INSEAD Class of July '10
 Q50  V46
Send PM
Re: Is |a|=b-c ? (1) a+c b (2) a<0 [#permalink] Is |a|=b-c ? (1) a+c b (2) a<0   30 Jun 2008, 02:21
saurabhkowley18 wrote:
Hi can you explain how a+b not equal to c is would ans the Q ?

If the question was:
[quote]Is |a|=b-c ?

(1) a+b≠c

(2) a0)

(1) tells us a≠c-b

==> we can conclude a = something else i.e. |a|≠b-c



Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Data Sufficiency (DS) Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
GMAT Club Bot
gmatclubot
Re: Is |a|=b-c ? (1) a+c b (2) a<0 [#permalink]
30 Jun 2008, 02:21
Moderators:
Bunuel
Math Expert
93351 posts
yashikaaggarwal
Senior Moderator - Masters Forum
3137 posts
GMATBusters
GMAT Tutor
1905 posts