GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 16 Jun 2019, 11:54 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

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.  If a^3b^4c^7 > 0. Which of the following statements must be true?

Author Message
TAGS:

Hide Tags

Math Expert V
Joined: 02 Sep 2009
Posts: 55614
If a^3b^4c^7 > 0. Which of the following statements must be true?  [#permalink]

Show Tags 00:00

Difficulty:   35% (medium)

Question Stats: 67% (00:57) correct 33% (01:23) wrong based on 24 sessions

HideShow timer Statistics

If $$a^3b^4c^7>0$$. Which of the following statements must be true?

I. $$ab$$ is negative

II. $$abc$$ is positive

III. $$ac$$ is positive

A. I only
B. II only
C. III only
D. I and III only
E. I, II and III

_________________
ISB School Moderator S
Joined: 08 Dec 2013
Posts: 419
Location: India
Concentration: Nonprofit, Sustainability
GMAT 1: 630 Q47 V30 WE: Operations (Non-Profit and Government)
Re: If a^3b^4c^7 > 0. Which of the following statements must be true?  [#permalink]

Show Tags

Bunuel wrote:
If $$a^3b^4c^7>0$$. Which of the following statements must be true?

I. $$ab$$ is negative

II. $$abc$$ is positive

III. $$ac$$ is positive

A. I only
B. II only
C. III only
D. I and III only
E. I, II and III

From the given, ac>0

I. We don't know anything about b.

II. ac>0 but b can be anything +ve/-ve

III ac>0, definitely true.

_________________
Kindly drop a '+1 Kudos' if you find this post helpful.

GMAT Math Book

-I never wanted what I gave up
I never gave up what I wanted-
CEO  P
Joined: 18 Aug 2017
Posts: 3834
Location: India
Concentration: Sustainability, Marketing
GPA: 4
WE: Marketing (Energy and Utilities)
Re: If a^3b^4c^7 > 0. Which of the following statements must be true?  [#permalink]

Show Tags

Bunuel wrote:
If $$a^3b^4c^7>0$$. Which of the following statements must be true?

I. $$ab$$ is negative

II. $$abc$$ is positive

III. $$ac$$ is positive

A. I only
B. II only
C. III only
D. I and III only
E. I, II and III

only option III is logically correct , rest others we get both yes & no
IMO C
_________________
If you liked my solution then please give Kudos. Kudos encourage active discussions. Re: If a^3b^4c^7 > 0. Which of the following statements must be true?   [#permalink] 23 May 2019, 10:06
Display posts from previous: Sort by

If a^3b^4c^7 > 0. Which of the following statements must be true?  