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

It is currently 16 Sep 2014, 14:07

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 product of three integers XYZ a prime? (1) X=Y (2) Z=1

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
SVP
SVP
User avatar
Joined: 03 Feb 2003
Posts: 1613
Followers: 6

Kudos [?]: 46 [0], given: 0

Is a product of three integers XYZ a prime? (1) X=Y (2) Z=1 [#permalink] New post 19 Jun 2003, 07:18
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 1 sessions
Is a product of three integers XYZ a prime?

(1) X=–Y
(2) Z=1
Manager
Manager
User avatar
Joined: 03 Jun 2003
Posts: 84
Location: Uruguay
Followers: 1

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

 [#permalink] New post 19 Jun 2003, 11:29
C?

From 1, maybe or maybe not
From 2, nothing

Together, you now it is impossible to get a prime
Manager
Manager
avatar
Joined: 12 Mar 2003
Posts: 59
Followers: 1

Kudos [?]: 1 [0], given: 0

GMAT Tests User
 [#permalink] New post 19 Jun 2003, 14:33
Ans : C

1) Z could be -ve thus => insuff
2) X*Y could be prime => insuff

Combined :

X*Y*Z = -ve number

and since X=-Y, X*X can never be prime

Ans NO => Suff
SVP
SVP
User avatar
Joined: 03 Feb 2003
Posts: 1613
Followers: 6

Kudos [?]: 46 [0], given: 0

 [#permalink] New post 19 Jun 2003, 21:37
tzolkin wrote:
Ans : C

1) Z could be -ve thus => insuff
2) X*Y could be prime => insuff

Combined :

X*Y*Z = -ve number

and since X=-Y, X*X can never be prime

Ans NO => Suff


You move in the right direction, either set is not sufficient. Combine -- the product is –X^2, a negative number can NEVER be a prime! If X=0, then tha product is 0, which is not prime either. Thus, C.
Current Student
avatar
Joined: 28 Dec 2004
Posts: 3405
Location: New York City
Schools: Wharton'11 HBS'12
Followers: 13

Kudos [?]: 159 [0], given: 2

GMAT Tests User
 [#permalink] New post 06 Feb 2007, 11:03
I would say this has to be B...

x*y*z=prime?

1) x=-y, lets see if x=2, then y=-2 x*y=-4*if z=-1 then product not a prime..suppose x=-1 y=1 then -1*z if z=-3 then product is 3 (prime) Insuff

2) z=1, taking above example.....

1*-2*2=-4 not a prime..you can try other numbers...it will always never be a prime..B has to be it...

I wish styolar was around..to verify.but i think B is the right
VP
VP
User avatar
Joined: 22 Oct 2006
Posts: 1443
Schools: Chicago Booth '11
Followers: 7

Kudos [?]: 149 [0], given: 12

GMAT Tests User
 [#permalink] New post 06 Feb 2007, 11:29
fresinha12 wrote:
I would say this has to be B...

x*y*z=prime?

1) x=-y, lets see if x=2, then y=-2 x*y=-4*if z=-1 then product not a prime..suppose x=-1 y=1 then -1*z if z=-3 then product is 3 (prime) Insuff

2) z=1, taking above example.....

1*-2*2=-4 not a prime..you can try other numbers...it will always never be a prime..B has to be it...

I wish styolar was around..to verify.but i think B is the right




B is insuff

because 1 * 1 * 1 Not Prime
2 * 1 * 1 Prime
  [#permalink] 06 Feb 2007, 11:29
    Similar topics Author Replies Last post
Similar
Topics:
Is a product of three integers XYZ a prime? (1) X=-Y (2) Z=1 yezz 2 10 Aug 2009, 09:59
Is a product of three integers XYZ a prime? (1) X= Y (2) Z=1 yezz 9 05 Sep 2006, 08:33
xy>z? 1) xyz=1 2) xyz^2>1 pls, provide ur explanation foolbox 8 23 Apr 2006, 03:15
Is xy > z? 1). xyz=1 2). xyz^2 > 1 getzgetzu 2 27 Nov 2005, 02:52
What is the ratio of x:y:z ST1 z=1 AND xy= 32 ST2 x/y =2 z/y mand-y 6 23 Nov 2005, 09:11
Display posts from previous: Sort by

Is a product of three integers XYZ a prime? (1) X=Y (2) Z=1

  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®.