BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

integers

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Master | Next Rank: 500 Posts
Posts: 129
Joined: Mon Dec 15, 2008 11:43 pm
Location: Hyderabad
Thanked: 2 times

integers

by naaga » Thu Feb 12, 2009 7:20 am
If x and y are nonzero integers, is an integer?
(1) x is the product of 2 and some other integer.
(2) There is only one pair of positive integers whose product equals y.
Top
Source: — Data Sufficiency |
User avatar
Site Admin
Posts: 2567
Joined: Thu Jan 01, 2009 10:05 am
Thanked: 712 times
Followed by:550 members
GMAT Score:770

by DanaJ » Thu Feb 12, 2009 7:39 am
You missed smth here:
"If x and y are nonzero integers, is an integer?"
Is who an integer? I'll assume it's x/y. Don't consider my explanation if this is not the case.
1. if x is the product of 2 and some other integer, this makes x even. But since we do not know anything about y, then we can't tell if x/y is an integer.
2. actually leads us to believe that y is prime, since only prime numbers have exactly one pair of positive divisors, 1 and the number itself. Since we don't have any more info about x, then we can't solve this one.

Taking both equations together won't help, so my guess is E.
Top
Post new topic Post Reply
• Page 1 of 1