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

It is currently 20 Aug 2014, 07:18

Going on Right now:

Live Q&A Session with Cambridge Admissions Team   ||    Join Chat Room to Attend the Session


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

If n is an integer and x^n - x^-n = 0, what is the value of

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Senior Manager
Senior Manager
avatar
Joined: 07 Jan 2008
Posts: 297
Followers: 1

Kudos [?]: 18 [0], given: 0

GMAT Tests User
If n is an integer and x^n - x^-n = 0, what is the value of [#permalink] New post 21 May 2008, 06:09
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
If n is an integer and x^n - x^-n = 0, what is the value of x?

1) x is an integer
2) x <> 0 [x is not equal to 0]
Current Student
avatar
Joined: 28 Dec 2004
Posts: 3405
Location: New York City
Schools: Wharton'11 HBS'12
Followers: 13

Kudos [?]: 158 [0], given: 2

GMAT Tests User
Re: DS - Set 29 [#permalink] New post 21 May 2008, 08:58
i get E..

x can be 0, -1, 1

1) says x is an integer ok..but it can be 0, -1 or 1
2) says x is not 0..it can be 1, or -1

we need to know N..if N is even..yes.. if odd yes too..
Manager
Manager
User avatar
Joined: 24 Apr 2008
Posts: 162
Followers: 1

Kudos [?]: 35 [0], given: 0

Re: DS - Set 29 [#permalink] New post 22 May 2008, 04:00
Ans is E

x^n -x^-n = 0 will imply either x = 1 or n=0

st1: X could take any value when n=0 so insuffi
st2: X can never be 0 and doesnot give an exact ans so insuffi

So E
Senior Manager
Senior Manager
avatar
Joined: 19 Apr 2008
Posts: 325
Followers: 3

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

GMAT Tests User
Re: DS - Set 29 [#permalink] New post 22 May 2008, 15:14
I simplyfied given equation as following

x^2n-1=0

x^2n=1

for this to be true , we must know if x =1/-1 and/or n=0/even ...none of this information given in 2 condition so answer E .
Re: DS - Set 29   [#permalink] 22 May 2008, 15:14
    Similar topics Author Replies Last post
Similar
Topics:
1 Experts publish their posts in the topic If m and n are integers and x>0, what is value of x^m + x^n? newbornmuse 2 20 Jun 2014, 04:23
3 Experts publish their posts in the topic In the expression above, if xn#0, what is the value of S? Walkabout 5 18 Dec 2012, 07:13
Experts publish their posts in the topic If n is an integer and x^n – x^-n = 0, what is the value of DeeptiM 3 05 Sep 2011, 11:17
If n is an integer and x^n x^(-n) = 0, what is the value of vivektripathi 3 13 Dec 2008, 22:54
2 Experts publish their posts in the topic If n is an integer and x^(n) x^(-n) = 0, what is the value GGUY 4 14 Mar 2008, 23:31
Display posts from previous: Sort by

If n is an integer and x^n - x^-n = 0, what is the value of

  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®.