It is currently 13 Dec 2017, 16:47

Decision(s) Day!:

CHAT Rooms | Ross R1 | Kellogg R1 | Darden R1 | Tepper R1


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.

Close

Request Expert Reply

Confirm Cancel

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

Is A^3*B^2*C^3>0 1.BC<0 2.AC>0

  post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
VP
VP
avatar
Joined: 22 Nov 2007
Posts: 1078

Kudos [?]: 699 [0], given: 0

Is A^3*B^2*C^3>0 1.BC<0 2.AC>0 [#permalink]

Show Tags

New post 16 Feb 2008, 03:15
1
This post was
BOOKMARKED
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Is A^3*B^2*C^3>0

1.BC<0
2.AC>0

Kudos [?]: 699 [0], given: 0

Director
Director
User avatar
Joined: 12 Jul 2007
Posts: 857

Kudos [?]: 340 [0], given: 0

Re: inequalities [#permalink]

Show Tags

New post 16 Feb 2008, 05:55
Answer B

In the original question stem B will always be positive. Meaning we're really only concerned about A and C. Statement 2 tells us that AC>0, so A and C have the same sign. It doesn't matter which sign it is. If they're negative, they'll have a positive product. If they're positive they'll have a positive product. Then B is positive, so yes, A^3*B^2*C^3 is greater than 0.

Kudos [?]: 340 [0], given: 0

VP
VP
avatar
Joined: 22 Nov 2007
Posts: 1078

Kudos [?]: 699 [0], given: 0

Re: inequalities [#permalink]

Show Tags

New post 16 Feb 2008, 07:00
eschn3am wrote:
Answer B

In the original question stem B will always be positive. Meaning we're really only concerned about A and C. Statement 2 tells us that AC>0, so A and C have the same sign. It doesn't matter which sign it is. If they're negative, they'll have a positive product. If they're positive they'll have a positive product. Then B is positive, so yes, A^3*B^2*C^3 is greater than 0.


you forget about the case in which B=0

Kudos [?]: 699 [0], given: 0

SVP
SVP
avatar
Joined: 28 Dec 2005
Posts: 1543

Kudos [?]: 189 [0], given: 2

Re: inequalities [#permalink]

Show Tags

New post 16 Feb 2008, 07:22
gah, read the question wrong as A^2 instead of A^3 !!! That rightly messed things up for me.

Upon further consideration, B is right :)

Kudos [?]: 189 [0], given: 2

Director
Director
User avatar
Joined: 12 Jul 2007
Posts: 857

Kudos [?]: 340 [0], given: 0

Re: inequalities [#permalink]

Show Tags

New post 16 Feb 2008, 08:25
marcodonzelli wrote:
eschn3am wrote:
Answer B

In the original question stem B will always be positive. Meaning we're really only concerned about A and C. Statement 2 tells us that AC>0, so A and C have the same sign. It doesn't matter which sign it is. If they're negative, they'll have a positive product. If they're positive they'll have a positive product. Then B is positive, so yes, A^3*B^2*C^3 is greater than 0.


you forget about the case in which B=0


Ahhh, good call. We need to know that B is not = to 0.

C it is. Good catch 8-)

Kudos [?]: 340 [0], given: 0

Director
Director
User avatar
Joined: 31 Mar 2007
Posts: 574

Kudos [?]: 82 [0], given: 0

Location: Canada eh
Re: inequalities [#permalink]

Show Tags

New post 16 Feb 2008, 10:17
Wrong.
C.

2) Tells you A & C are both negative or positive, along with not being equal to 0.

But, you don't know if B is 0 or not. If B is not 0, then yes, the equation is larger than 0. However, B can be 0, in which case the equation is equal to 0, and it is not bigger than 0.

1 & 2 together tell you that B is non-null.

Kudos [?]: 82 [0], given: 0

Re: inequalities   [#permalink] 16 Feb 2008, 10:17
Display posts from previous: Sort by

Is A^3*B^2*C^3>0 1.BC<0 2.AC>0

  post reply Question banks Downloads My Bookmarks Reviews Important topics  

Moderator: chetan2u



GMAT Club MBA Forum Home| About| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

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®.