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

It is currently 21 Oct 2014, 10:46

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 a/b < 0?

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Senior Manager
Senior Manager
avatar
Joined: 29 Jan 2011
Posts: 387
Followers: 0

Kudos [?]: 57 [0], given: 87

Is a/b < 0? [#permalink] New post 19 Jun 2011, 15:32
2
This post was
BOOKMARKED
00:00
A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

68% (01:45) correct 32% (02:56) wrong based on 110 sessions
Is a/b < 0?

(1) a^2/b^3 > 0

(2) ab^4 < 0
[Reveal] Spoiler: OA

Last edited by siddhans on 20 Jun 2011, 21:30, edited 1 time in total.
1 KUDOS received
SVP
SVP
avatar
Joined: 16 Nov 2010
Posts: 1691
Location: United States (IN)
Concentration: Strategy, Technology
Followers: 30

Kudos [?]: 297 [1] , given: 36

Premium Member Reviews Badge
Re: MGMAT DS [#permalink] New post 19 Jun 2011, 17:20
1
This post received
KUDOS
The answer is C.

(1) says that b > 0, since a^2 is always positive, so we don't know the sign of a. Insufficient.

(2) says a is negative as b^4 is always positive, so we don't know the sign of b. Insufficient.

(1) + (2) Sufficient as we know signs of both a and b.

Answer - C.
_________________

Formula of Life -> Achievement/Potential = k * Happiness (where k is a constant)

Get the best GMAT Prep Resources with GMAT Club Premium Membership

Intern
Intern
avatar
Joined: 18 Mar 2013
Posts: 5
Followers: 0

Kudos [?]: 2 [0], given: 45

Positives and Negatives [#permalink] New post 10 May 2013, 12:09
Is [a]/[b] < 0?


(1) a[square_root]/[b3]> 0
(2) ab4 < 0
1 KUDOS received
Manager
Manager
User avatar
Status: Pushing Hard
Affiliations: GNGO2, SSCRB
Joined: 30 Sep 2012
Posts: 92
Location: India
Concentration: Finance, Entrepreneurship
GPA: 3.33
WE: Analyst (Health Care)
Followers: 1

Kudos [?]: 62 [1] , given: 11

Reviews Badge
Re: Positives and Negatives [#permalink] New post 10 May 2013, 20:21
1
This post received
KUDOS
The question basically asks ....

IS lal < 0 ??

or a < 0 & a > 0 ......Does the value of a >0 & a <0 .....

Statement : 1 says ...... \sqrt{{a}} / l{b^3}l > 0

or \sqrt{{a}}> 0

or a > 0 ... Clearly Insufficient as it doesn't tell us if a< 0 also......Therefore, Insufficient.

Statement :: 2 ... Similar to statement it just tells us one part ... i.e;

as Given ... ab^4 < 0 ... or a <0 .... Clearly, Insufficient.

1+2 ...... gives us that a<0 & a > 0 ..... Therefore, Sufficient.......

Hence, C ................. Hope it Helps !!
_________________

If you don’t make mistakes, you’re not working hard. And Now that’s a Huge mistake.

Expert Post
Math Expert
User avatar
Joined: 02 Sep 2009
Posts: 23355
Followers: 3604

Kudos [?]: 28717 [0], given: 2820

Re: Positives and Negatives [#permalink] New post 11 May 2013, 02:55
Expert's post
Intern
Intern
avatar
Joined: 28 May 2013
Posts: 26
Followers: 0

Kudos [?]: 9 [0], given: 2

Re: Is a/b < 0? (1)a^2/b^3 > 0 (2) ab^4 < 0 [#permalink] New post 08 Oct 2013, 07:35
Hi Bunuel/All ,

Why are we not considering a & b to be fractions?

Regards
Akshay
Expert Post
Veritas Prep GMAT Instructor
User avatar
Joined: 16 Oct 2010
Posts: 4877
Location: Pune, India
Followers: 1152

Kudos [?]: 5349 [0], given: 165

Re: Is a/b < 0? (1)a^2/b^3 > 0 (2) ab^4 < 0 [#permalink] New post 08 Oct 2013, 22:51
Expert's post
AkshayChittoria wrote:
Hi Bunuel/All ,

Why are we not considering a & b to be fractions?

Regards
Akshay


Responding to a pm:

a and b could be fractions. We are not assuming that they must be integers. We are only talking about their sign.

(1)a^2/b^3 > 0

It doesn't matter whether a and b are fractions or integers, a^2 will be positive. So b must be positive since positive/b^3 is positive. But we don't know whether a is positive or negative. Can't say about the sign of a/b

(2) ab^4 < 0

b^4 must be positive. So a must be negative because a/positive is negative. Can't say about the sign of a/b

Both together, b is positive and a is negative so a/b must be negative. Sufficient.
_________________

Karishma
Veritas Prep | GMAT Instructor
My Blog

Save $100 on Veritas Prep GMAT Courses And Admissions Consulting
Enroll now. Pay later. Take advantage of Veritas Prep's flexible payment plan options.

Veritas Prep Reviews

Intern
Intern
avatar
Joined: 28 May 2013
Posts: 26
Followers: 0

Kudos [?]: 9 [0], given: 2

Re: Is a/b < 0? [#permalink] New post 09 Oct 2013, 00:27
Thanks Karishma :) . I think sometimes it is better not to think too much and skip some possible scenarios :P :P .
Manager
Manager
avatar
Joined: 24 Apr 2013
Posts: 75
Location: United States
Followers: 0

Kudos [?]: 6 [0], given: 23

Re: Is a/b < 0? [#permalink] New post 17 Oct 2013, 01:26
Clumsy mistake.
I read st 2 as (ab)^4 <0
_________________

Struggling: make or break attempt

Re: Is a/b < 0?   [#permalink] 17 Oct 2013, 01:26
    Similar topics Author Replies Last post
Similar
Topics:
Experts publish their posts in the topic If ab − bc^2 < 0, is a < 0? goodyear2013 1 13 Jan 2014, 04:25
Experts publish their posts in the topic Is 0< a/b < 1? jenl2881 3 13 Nov 2013, 15:17
2 If 0 < ab < ac, is a negative? KarolPL 3 15 Nov 2012, 11:08
4 Experts publish their posts in the topic If ab <> 0 and points (-a,b) and (-b,a) are in the same ahirjoy 12 12 Mar 2010, 14:35
Is A/B < 0 - Help Wengen 5 17 Jul 2009, 16:10
Display posts from previous: Sort by

Is a/b < 0?

  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®.