|
|
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.
11 Apr 2018, 09:02
Kudos
Bookmarks
C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
55%
(hard)
Question Stats:
52% (01:18) correct
48%
(01:04)
wrong
based on 291
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
Pure algebraic questions like this one are no longer part of the GMAT Data Sufficiency syllabus.
For relevant Data Sufficiency questions, please check the Data Sufficiency forum:
Data Sufficiency Forum
Data Sufficiency Forum
11 Apr 2018, 10:41
Kudos
Bookmarks
Bunuel
when can be x*y*z be a prime number..
when any TWO of them give us a product of 1 or -1 that is xy or xz or yz is 1 or -1 and the THIRD is a prime number..
(1) x = -y
when x=1, y = -1, so if z is -3...... 1*-1*-3 = 3 Yes
but if x =2 , y =-2, z any other value , ans is NO
insuff
(2) z = 1
nothing about x and y...
insuff
combined..
z=1..
if x = 1 and y = -1 product = -1...No
any other value of x and y will also give a negative integer..
ans is NO always
Suff
C
22 Apr 2018, 18:22
Kudos
Bookmarks
I) gives -(y^2)*z after putting value in equation
This could give me prime if y=1 and z=-3
And other case also possible so insufficient
II)z=1 yields nothing could be prime ,could not be
Combining both if z=1 then
Eqn become -y^2
It is negative so can't be prime
Ans C
Posted from my mobile device
This could give me prime if y=1 and z=-3
And other case also possible so insufficient
II)z=1 yields nothing could be prime ,could not be
Combining both if z=1 then
Eqn become -y^2
It is negative so can't be prime
Ans C
Posted from my mobile device
