|
|
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
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
10 Aug 2009, 10:59
Kudos
Bookmarks
N
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
(N/A)
Question Stats:
100% (00:00) correct
0%
(00:00)
wrong
based on 4
sessions
History
Date
Time
Result
Not Attempted Yet
Is a product of three integers XYZ a prime?
(1) X=-Y
(2) Z=1
(1) X=-Y
(2) Z=1
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Data Sufficiency (DS) Forum
Still interested in this question? Check out the "Best Topics" block below for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
10 Aug 2009, 12:16
Kudos
Bookmarks
E for me.
1) X = -Y. therefore, XYZ = -X^2 Z. Not sure abt the value of Z, so Insuff
2) Z = 1. Insuff
Comb both, -X^2 , square of a number if never prime e.g. 2^2 = 4 has 1,2,4 as factors
1) X = -Y. therefore, XYZ = -X^2 Z. Not sure abt the value of Z, so Insuff
2) Z = 1. Insuff
Comb both, -X^2 , square of a number if never prime e.g. 2^2 = 4 has 1,2,4 as factors
10 Aug 2009, 22:33
Kudos
Bookmarks
yezz
C for me
For XYZ to be prime we need to have a positive product so values could be:
1)1*1*(any prime)
2)1*(-1)*-(any prime)
3) -1*-1*any prime
St 1 tells us that either X or Y is +ve, so we know that XY is -ve. We know nothing about Z. Please note that negative numbers cannot be primes, but there is still a possibility for the variant 2.
St 2 tells us Z=1. we know nothing about X and Y
Combining two statements together we can answer the question:
If X is any number we get a negative product of XYZ, and we know that no prime number can be negative. So answer is NO, thus SUFF
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Data Sufficiency (DS) Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
