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

 It is currently 06 Jul 2015, 13:06

### 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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# DS 6

Author Message
TAGS:
SVP
Joined: 16 Oct 2003
Posts: 1813
Followers: 4

Kudos [?]: 56 [0], given: 0

DS 6 [#permalink]  26 May 2004, 19:20
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
Attachments

d3.JPG [ 6.19 KiB | Viewed 659 times ]

SVP
Joined: 30 Oct 2003
Posts: 1794
Location: NewJersey USA
Followers: 5

Kudos [?]: 43 [0], given: 0

A) xyz > 0 if y = -1 z = 1 and x = -1 then xyz > 0 but x(y+z) = 0 (Insufficient)
B) yz > 0 y = -1, z = -1 yz = 1 > 0 if x = 1 then xyz = 1 > 0 but if x = -1 then xyz < 0 (Insufficient)

Combine these make y = -1 z = -2 then x has to be +ve because xyz > 0
Let x = 1 1(-1+-2) = -3
if y = 1 x = 2 and x = 1 then 1(1+2) = 3
(Insufficient)

Director
Joined: 05 May 2004
Posts: 577
Location: San Jose, CA
Followers: 2

Kudos [?]: 36 [0], given: 0

Re: DS 6 [#permalink]  28 May 2004, 17:12
Bhai wrote:

Ans: E

yz>0
xyz>0
which means x is positive
but y,z can be either positive or negative!
Manager
Joined: 07 May 2004
Posts: 183
Location: Ukraine, Russia(part-time)
Followers: 2

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

Re: DS 6 [#permalink]  29 May 2004, 02:30
Bhai wrote:

1 and 2 together are not sufficient, because

x = 1, y = -2, z = -3 satisfy 1 and 2 but do not satisfy x(y+z)>0.
Intern
Joined: 26 Jan 2003
Posts: 28
Location: Reality
Followers: 1

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

Re: DS 6 [#permalink]  29 May 2004, 11:36
Bhai wrote:

(2) y>0, z>0 or y<0, z<0 (insufficient)
(1) x>0, yz>0 or x<0, yz<0 (insufficient)
(1)and(2) x>0, yz>0, y?0, z?0 => (y+z)?0

Re: DS 6   [#permalink] 29 May 2004, 11:36
Similar topics Replies Last post
Similar
Topics:
DS -GMAT Prep2 - 6 2 28 Apr 2007, 14:18
DS 6 21 Aug 2006, 07:33
Question on DS help page, Example 6 6 14 Jun 2006, 06:12
ds 6 13 Nov 2005, 17:37
DS 1 21 Oct 2005, 18:42
Display posts from previous: Sort by

# DS 6

 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®.