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

It is currently 21 Aug 2014, 20:17

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 -x/(-y)(-z) -ve?? 1) x*y >0 2)xyz>0

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
SVP
SVP
User avatar
Joined: 05 Jul 2006
Posts: 1542
Followers: 5

Kudos [?]: 67 [0], given: 39

Is -x/(-y)(-z) -ve?? 1) x*y >0 2)xyz>0 [#permalink] New post 11 Sep 2006, 09:21
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
Is -x/(-y)(-z) -ve??

1) x*y >0
2)xyz>0
Director
Director
avatar
Joined: 13 Nov 2003
Posts: 801
Location: BULGARIA
Followers: 1

Kudos [?]: 19 [0], given: 0

GMAT Tests User
 [#permalink] New post 11 Sep 2006, 09:33
Interesting.

A) Given X and Y are either both pos or neg but the sign of Z is unknown. Stmnt A is NOT suff
B) possible scenarios either X,Y,Z are pos or 2 of them are neg. In either case the stem is neg so B)

B) SUFF
Director
Director
User avatar
Joined: 09 Oct 2005
Posts: 728
Location: Madrid
Followers: 3

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

GMAT Tests User
 [#permalink] New post 11 Sep 2006, 09:47
BG wrote:
Interesting.

A) Given X and Y are either both pos or neg but the sign of Z is unknown. Stmnt A is NOT suff
B) possible scenarios either X,Y,Z are pos or 2 of them are neg. In either case the stem is neg so B)

B) SUFF

lets pick numbers x,y and z
x=-1 y=-2 z =3
x-ve y-ve and z+ve
Is -x/(-y)(-z) -ve??

1/(2)*(-3) so it is -ve

if x=1 y=-2 z=-3
-1/(2)*(3) it is -ve
if x=-1 y=2 z=-3
1/-2*3 - ve
Oops it seems like B it is

:oops:
_________________

IE IMBA 2010

CEO
CEO
User avatar
Joined: 20 Nov 2005
Posts: 2922
Schools: Completed at SAID BUSINESS SCHOOL, OXFORD - Class of 2008
Followers: 15

Kudos [?]: 79 [0], given: 0

GMAT Tests User
Re: DS INIQUALITIES [#permalink] New post 12 Sep 2006, 07:47
yezz wrote:
Is -x/(-y)(-z) -ve??

1) x*y >0
2)xyz>0

B

signs of xyz or x/yz or xy/z etc will always be same.

so for the sign purpose we can consider -x/(-y)(-z) as (-xyz)

B clearly says that xyz > 0 so
(-xyz) will always be less than 0, so will be -x/(-y)(-z)
_________________

SAID BUSINESS SCHOOL, OXFORD - MBA CLASS OF 2008

Current Student
avatar
Joined: 28 Dec 2004
Posts: 3405
Location: New York City
Schools: Wharton'11 HBS'12
Followers: 13

Kudos [?]: 158 [0], given: 2

GMAT Tests User
Re: DS INIQUALITIES [#permalink] New post 12 Sep 2006, 08:07
ps_dahiya wrote:
yezz wrote:
Is -x/(-y)(-z) -ve??

1) x*y >0
2)xyz>0

B

signs of xyz or x/yz or xy/z etc will always be same.

so for the sign purpose we can consider -x/(-y)(-z) as (-xyz)

B clearly says that xyz > 0 so
(-xyz) will always be less than 0, so will be -x/(-y)(-z)


suppose y,z are both negative, -1, -1 and x is positive 1

-1/(- -1)*(- -1) the entire sum is negative..

IMO it should be C..
SVP
SVP
User avatar
Joined: 05 Jul 2006
Posts: 1542
Followers: 5

Kudos [?]: 67 [0], given: 39

 [#permalink] New post 12 Sep 2006, 08:44
nice ralley everyone.

The OA is B

HOPE YOU ENJOYED IT
SVP
SVP
User avatar
Joined: 05 Jul 2006
Posts: 1542
Followers: 5

Kudos [?]: 67 [0], given: 39

 [#permalink] New post 14 Sep 2006, 09:22
if we simplified

-x/(-y*-z) to -x/yz = -1(x/yz)

and since x/yz will always be positive then -1(x/yz)
will always be negative

that is the OE
  [#permalink] 14 Sep 2006, 09:22
    Similar topics Author Replies Last post
Similar
Topics:
5 If xyz > 0, is x > 0? (1) xy > 0 (2) xz > 0 DestinyChild 8 10 Jan 2010, 18:31
If xyz > 0, is x > 0? (1) xy > 0 (2) xz > 0 tarek99 5 31 Mar 2008, 11:43
If xyz > 0, is x>0? 1) xy> 0 2) xz>0 jlui4477 3 24 Feb 2006, 19:04
Is XYZ > 0? 1) XY > 0 2) YZ> 0 joemama142000 3 07 Jan 2006, 15:13
If xyz > 0, is x > 0? (1) xy > 0 (2) xz > 0 TeHCM 7 17 Dec 2005, 22:49
Display posts from previous: Sort by

Is -x/(-y)(-z) -ve?? 1) x*y >0 2)xyz>0

  Question banks Downloads My Bookmarks Reviews Important topics  


cron

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®.