Find all School-related info fast with the new School-Specific MBA Forum
Learn more about the recent changes... close

It is currently 23 May 2013, 22:28
Customize  |  Hide

Search
Register
New posts
Unanswered

M02#32

  Question banks Downloads My Bookmarks Reviews  
  Oldest Best Reply
Search for:
 
Print view
First unread post
Author Message
Senior Manager
Senior Manager
Status: Do and Die!!
Joined: 15 Sep 2010
Posts: 337
Followers: 1

Kudos [?]: 27 [0], given: 192

M02#32 [#permalink] New post 23 Dec 2010, 10:45
00:00

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
What is the value ofx^2 ?

1) X= \sqrt{2X-1}

2) x^2 = x^3

why statmnt 2 isn't sufficient. we are asked to find the value of X^2. So X=0 or X=1
isn't it Yes / No question, where , when we come up with two answers we reject the solution.
Please clarify
Thanks
_________________

I'm the Dumbest of All !!

1 KUDOS received
GMAT Club team member
User avatar
Joined: 02 Sep 2009
Posts: 11594
Followers: 1799

Kudos [?]: 9585 [1] , given: 826

GMAT Tests User CAT Tests
Top Member of the Month
Re: M02#32 [#permalink] New post 23 Dec 2010, 10:58
1
This post received
KUDOS
shrive555 wrote:
What is the value ofx^2 ?

1) X= \sqrt{2X-1}

2) x^2 = x^3

why statmnt 2 isn't sufficient. we are asked to find the value of X^2. So X=0 or X=1
isn't it Yes / No question, where , when we come up with two answers we reject the solution.
Please clarify
Thanks


In a Yes/No Data Sufficiency question, statement is sufficient if the answer is “always yes” or “always no” while a statement is insufficient if the answer is "sometimes yes" and "sometimes no".

If the GMAT asks, in a DS question, for a value, you only have sufficient information if you can get a single numerical value for the answer.

What is the value of x^2?

(1) x=\sqrt{2x-1} --> square both sides --> x^2=2x-1 --> x^2-2x+1=0 --> (x-1)^2=0 --> x=1 --> x^2=1, we have a single numerical value of x^2. Sufficient.

(2) x^2=x^3 --> x^2(x-1)=0 --> x=0 or x=1, we can not get a single numerical value for the answer. Not sufficient.

Answer: A.

Hope it's clear.
_________________

PLEASE READ AND FOLLOW: 11 Rules for Posting!!!

RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory

COLLECTION OF QUESTIONS:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. NEW!!!

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS ; 9 Devil's Dozen!!!; 10 Number Properties set. NEW!!!


What are GMAT Club Tests?
25 extra-hard Quant Tests

Find out what's new at GMAT Club - latest features and updates

Senior Manager
Senior Manager
Status: Do and Die!!
Joined: 15 Sep 2010
Posts: 337
Followers: 1

Kudos [?]: 27 [0], given: 192

Re: M02#32 [#permalink] New post 23 Dec 2010, 11:27
Only one numerical value for the answer !!! Got it...
Thanks B
_________________

I'm the Dumbest of All !!

Re: M02#32   [#permalink] 23 Dec 2010, 11:27
Display posts from previous: Sort by

M02#32

  Question banks Downloads My Bookmarks Reviews  
Print view
First unread post

Moderator: Bunuel

Search for:


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®.

Main navigation

GMAT Resources

Partners

MBA Resources

www.gmac.com|www.mba.com