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

It is currently 22 Oct 2014, 05:00

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 x and y are positive, which of the following must be

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Senior Manager
Senior Manager
avatar
Joined: 05 Aug 2005
Posts: 415
Followers: 1

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

If x and y are positive, which of the following must be [#permalink] New post 22 Sep 2006, 21:50
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 x and y are positive, which of the following must be greater than 1/√(x+y)?
I. √(x+y)/2x,
II. (√x+√y)/(x+y)
III. (√x-√y)/(x+y)

Please explain your solution.
Senior Manager
Senior Manager
avatar
Joined: 11 May 2006
Posts: 263
Followers: 1

Kudos [?]: 5 [0], given: 0

Re: DS:1/sqrt(x+y) [#permalink] New post 22 Sep 2006, 22:01
gmacvik wrote:
If x and y are positive, which of the following must be greater than 1/√(x+y)?
I. √(x+y)/2x,
II. (√x+√y)/(x+y)
III. (√x-√y)/(x+y)

Please explain your solution.


I pick II

let x = y then we need to find which ones are greater than 1/√(2x)

now I = 1/√(2x)

II = 2√x/2x = 1/√x

III = 0
Director
Director
User avatar
Joined: 06 May 2006
Posts: 782
Followers: 3

Kudos [?]: 14 [0], given: 0

 [#permalink] New post 22 Sep 2006, 22:49
  [#permalink] 22 Sep 2006, 22:49
    Similar topics Author Replies Last post
Similar
Topics:
If x and y are positive, which of the following must be arjsingh1976 1 03 Dec 2006, 05:08
If x and y are positive, which of the following must be ishtmeet 6 20 Oct 2006, 16:21
If x and y are positive, which of the following must be eagerbeaver 9 11 Oct 2006, 18:04
1 If x and y are positive, which of the following must be ns 5 17 Jun 2006, 14:15
If x and y are positive, which of the following must be M8 6 12 May 2006, 04:03
Display posts from previous: Sort by

If x and y are positive, which of the following must be

  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®.