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

It is currently 23 Jul 2014, 20:46

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 1+x+x^2+x^3+x^4>1/(1-x)? 1). x>0 2). x<1

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Manager
Manager
avatar
Joined: 04 Sep 2006
Posts: 117
Followers: 2

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

Is 1+x+x^2+x^3+x^4>1/(1-x)? 1). x>0 2). x<1 [#permalink] New post 04 Jun 2009, 10:34
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
Is 1+x+x^2+x^3+x^4>1/(1-x)?
1). x>0
2). x<1
Senior Manager
Senior Manager
User avatar
Joined: 16 Jan 2009
Posts: 362
Concentration: Technology, Marketing
GMAT 1: 700 Q50 V34
GPA: 3
WE: Sales (Telecommunications)
Followers: 2

Kudos [?]: 65 [0], given: 16

GMAT Tests User
Re: DS [#permalink] New post 04 Jun 2009, 13:55
Is 1+x+x^2+x^3+x^4>1/(1-x)?

1). x>0
1+x+x^2+x^3+x^4=1.X
Where X= x+x^2+x^3+x^4

Case 1:
1/(1-x) will be –ve for x>1
So , 1+x+x^2+x^3+x^4>1/(1-x)

Case 2:
1/(1-x) will be +ve for x<1
Insufficient to answer 1+x+x^2+x^3+x^4>1/(1-x)

INSUFFICIENT

2). x<1

1/(1-x) will be +ve for x<1
Insufficient to answer 1+x+x^2+x^3+x^4>1/(1-x)
INSUFFICIENT

TOGETHER :
For 1>x>0
1/(1-x) will be +ve
Insufficient to answer 1+x+x^2+x^3+x^4>1/(1-x)
INSUFFICIENT
IMO E
_________________

Lahoosaher

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

Kudos [?]: 35 [0], given: 8

GMAT Tests User
Re: DS [#permalink] New post 09 Jun 2009, 02:02
IMO C
1) with x=4 YES
With x=0.5 NO
2) with x=-3 YES
with x=0.5 NO
Together YES
Hence C
What 's the OA?
Manager
Manager
avatar
Joined: 28 Jan 2004
Posts: 205
Location: India
Followers: 2

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

GMAT Tests User
Re: DS [#permalink] New post 09 Jun 2009, 22:11
E
Agree with amolsk11.
Senior Manager
Senior Manager
User avatar
Joined: 15 Jan 2008
Posts: 295
Followers: 2

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

GMAT Tests User
Re: DS [#permalink] New post 10 Jun 2009, 00:26
IMO E too..

1+x+x2+x3+X4 < 1 / (1-x) for x = 0.1

1/(1-x) = 1/ 0.9 = 1.1111111

1+x+x2+x3+x4 = 1+ .1 + .01+.001 = 1.1111

but for x = 0.5, the equation doesnt hold good.

1/(1-x) = 1/0.5 = 2

1+0.5+0.25+0.625 = 2.15 > 2

hence E
Re: DS   [#permalink] 10 Jun 2009, 00:26
    Similar topics Author Replies Last post
Similar
Topics:
Experts publish their posts in the topic Is |x| < 1 ? 1. x^4 - 1 > 0 2. sag 3 27 Jul 2010, 06:27
Is |x-1|< 1 ? (1) (x-1)^2 <= 1 (2) x^2 - 1 > 0 jjhko 7 11 Sep 2008, 02:58
Is |x - 1|<1 ? 1) (x - 1) ^2 <=1 2) x ^2 -1>0 mbawaters 1 22 Jul 2008, 15:52
x is not 1, (1-x^5)/(1-x) <1>0 (2) x<1 using Jamesk486 1 12 May 2007, 06:55
Is |x-1| < 1 ? 1) (x-1)^2 <= 1 2) x^2 - 1 > 0 iced_tea 2 01 Oct 2006, 21:15
Display posts from previous: Sort by

Is 1+x+x^2+x^3+x^4>1/(1-x)? 1). x>0 2). x<1

  Question banks Downloads My Bookmarks Reviews Important topics  


cron

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®.