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

It is currently 21 Sep 2014, 22:21

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

What is the value of n? 1) n^2 - n = n - n^2 2) -n^2 = n

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Manager
Manager
User avatar
Joined: 30 Jan 2006
Posts: 146
Followers: 1

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

What is the value of n? 1) n^2 - n = n - n^2 2) -n^2 = n [#permalink] New post 13 Apr 2006, 14:49
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
What is the value of n?

1) n^2 - n = n - n^2

2) -n^2 = n
Manager
Manager
User avatar
Joined: 09 Feb 2006
Posts: 129
Location: New York, NY
Followers: 1

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

 [#permalink] New post 13 Apr 2006, 15:21
What is the value of n?

1) n^2 - n = n - n^2

2) -n^2 = n

Statement 1: 2n^2 = 2n
n^2 = n

This would be insufficient. because sqrt(n^2) could be positive or negative.

Statement 2: sufficient. This tells us that n = -1.

B
VP
VP
User avatar
Joined: 29 Apr 2003
Posts: 1408
Followers: 2

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

GMAT Tests User
 [#permalink] New post 13 Apr 2006, 16:34
jcgoodchild wrote:
What is the value of n?

1) n^2 - n = n - n^2

2) -n^2 = n

Statement 1: 2n^2 = 2n
n^2 = n

This would be insufficient. because sqrt(n^2) could be positive or negative.

Statement 2: sufficient. This tells us that n = -1.

B



B doesnt tell us that n= -1!!
- n^2 = n (given)
or, n^2 + n =0
or n(n+1) = 0

Thus n = 0 or n =-1! Hence we cannot conclusively prove that n ==-1! (this wud have wored if the question was modifird to say that n was non zero or n was positive)!

Hence E
VP
VP
User avatar
Joined: 29 Dec 2005
Posts: 1351
Followers: 6

Kudos [?]: 28 [0], given: 0

GMAT Tests User
Re: DS [#permalink] New post 13 Apr 2006, 19:55
C.
1) n^2 + n^2 = n + n
2n^2 = 2 n
n^2 = n
n^2 - n = 0
n (n-1) = 0

n = 0 or 1

2) -n^2 = n
n^2 + n= 0
n (n+1) = 0
n = 0, -1

from i and ii, n = 0
VP
VP
User avatar
Joined: 29 Apr 2003
Posts: 1408
Followers: 2

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

GMAT Tests User
 [#permalink] New post 13 Apr 2006, 22:02
Oh Yeah its C.. Tried to solve it mentally, did not notice!!

Its C!
Manager
Manager
User avatar
Joined: 30 Jan 2006
Posts: 146
Followers: 1

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

Re: DS [#permalink] New post 16 Apr 2006, 14:53
Professor wrote:
C.
1) n^2 + n^2 = n + n
2n^2 = 2 n
n^2 = n
n^2 - n = 0
n (n-1) = 0

n = 0 or 1

2) -n^2 = n
n^2 + n= 0
n (n+1) = 0
n = 0, -1

from i and ii, n = 0


OA is C.

A question:

In stmnt 1, we get:

n^2 + n^2 = n + n
2n^2 = 2 n

At this step, why can't we just divide by 2n on both sides to get to n = 1 ??? Would appreciate an explanation :oops:
Re: DS   [#permalink] 16 Apr 2006, 14:53
    Similar topics Author Replies Last post
Similar
Topics:
1 Experts publish their posts in the topic What is the value of n^2? mumbijoh 2 03 Dec 2013, 08:48
2 What is the value of the integer n? (1) N!= (N-1)!*N (2) dimri10 4 06 Jun 2011, 09:39
What is the value of n? (1) n(n 1)(n 2 ) = 0 (2) n^2 + n 6 = vageesh 2 11 Jan 2010, 05:50
If n = (1/9)n+2, what is the value of n? -2 -1 cool_jonny009 4 18 Feb 2006, 12:29
What is the value of n? (1) n(n 1)(n 2 ) = 0 (2) n2 + n 6 = briozeal 1 10 Oct 2005, 16:44
Display posts from previous: Sort by

What is the value of n? 1) n^2 - n = n - n^2 2) -n^2 = n

  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®.