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

It is currently 20 Oct 2014, 17:21

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

a*b#0. Is |a|/|b|=a/b?

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Current Student
User avatar
Joined: 25 Aug 2011
Posts: 195
Location: India
GMAT 1: 730 Q49 V40
WE: Operations (Insurance)
Followers: 1

Kudos [?]: 85 [0], given: 11

a*b#0. Is |a|/|b|=a/b? [#permalink] New post 12 Feb 2012, 21:00
00:00
A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

73% (02:03) correct 27% (01:31) wrong based on 40 sessions
a*b#0. Is |a|/|b|=a/b?

(1) |a*b|=a*b
(2) |a|/|b|=|a/b|
[Reveal] Spoiler: OA

Last edited by Bunuel on 04 Dec 2012, 01:52, edited 3 times in total.
Edited the question and OA
Expert Post
Math Expert
User avatar
Joined: 02 Sep 2009
Posts: 23348
Followers: 3601

Kudos [?]: 28654 [0], given: 2808

Re: abs value II [#permalink] New post 12 Feb 2012, 21:05
Expert's post
devinawilliam83 wrote:
a*b#0. Is |a|/|b|=a/b?
(1) |a*b|=a*b
(2) |a|/|b|=|a/b|

the OA is D, how is 2 sufficient to answer the question?


It's not. You're right answer is A, not D.

a*b#0. Is |a|/|b|=a/b?

|a|/|b|=a/b is true if and only a and b have the same sign, meaning a/b is positive.

(1) |a*b|=a*b, means a and b are both positive or both negative, as LHS is never negative (well in this case LHS is positive as neither a nor b equals to zero). So, a/b is positive in any case. Hence |a|/|b|=a/b. Sufficient.

(2) |a|/|b|=|a/b|, from this we can not conclude whether they have the same sign or not: consider a=1, b=1 and a=1, b=-1 to see that these two sets give different answer to the question. Not sufficient.

Answer: A.
_________________

NEW TO MATH FORUM? PLEASE READ THIS: ALL YOU NEED FOR QUANT!!!

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; 7. Remainders; 8. Overlapping Sets; 9. PDF of Math Book; 10. Remainders; 11. GMAT Prep Software Analysis NEW!!!; 12. SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) NEW!!!; 12. Tricky questions from previous years. NEW!!!;

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. ,11 Mixed Questions, 12 Fresh Meat

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., 11 New DS set.


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

Get the best GMAT Prep Resources with GMAT Club Premium Membership

Re: abs value II   [#permalink] 12 Feb 2012, 21:05
    Similar topics Author Replies Last post
Similar
Topics:
21 Experts publish their posts in the topic If ab ≠ 0, is ab > a/b ? gmatquant25 9 25 May 2014, 11:32
1 Experts publish their posts in the topic ab = 0? Creeper300 1 07 Nov 2010, 12:49
3 Experts publish their posts in the topic If ab ≠ 0, does a=b? gmattokyo 14 06 Nov 2009, 07:36
7 Experts publish their posts in the topic If ab≠0 and points (-a,b) and (-b,a) are in the same yaron 134 28 Aug 2005, 08:46
For any numbers a and b, a * b = a + b ab. If a*b=0, which GMAT TIGER 3 09 Dec 2007, 23:17
Display posts from previous: Sort by

a*b#0. Is |a|/|b|=a/b?

  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®.