Target Test Prep 20% Off Flash Sale is on! Code: FLASH20

Redeem
Target Test Prep
5-Day Free Trial
5-day free, full-access trial TTP

Available with Beat the GMAT members only code

MORE DETAILS
Target Test Prep
Magoosh
Magoosh
Study with Magoosh GMAT prep

Available with Beat the GMAT members only code

MORE DETAILS
Magoosh

Can prime numbers be negative numbers as well?

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Master | Next Rank: 500 Posts
Posts: 416
Joined: Wed Oct 03, 2007 9:08 am
Thanked: 10 times
Followed by:1 members

Can prime numbers be negative numbers as well?

by gmatrant » Tue Jan 01, 2013 4:45 am
If x and y are prime numbers, what is the value of x+y ?
(1) x−y is a prime integer.

(2) y<x<6

In the above problem, can x and y be negative? Can prime numbers be negative numbers as well?
A kudos or thanks would do great if my answer has helped you :)
Top
Legendary Member
Posts: 512
Joined: Mon Jun 18, 2012 11:31 pm
Thanked: 42 times
Followed by:20 members

by sana.noor » Tue Jan 01, 2013 8:00 am
Negative number can not be a prime number...Is the answer "E"?
Work hard in Silence, Let Success make the noise.

If you found my Post really helpful, then don't forget to click the Thank/follow me button. :)
Top

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 3835
Joined: Fri Apr 02, 2010 10:00 pm
Location: Milpitas, CA
Thanked: 1854 times
Followed by:523 members
GMAT Score:770

by Anurag@Gurome » Tue Jan 01, 2013 8:13 am
gmatrant wrote:Can prime numbers be negative numbers as well?
No. Prime numbers are by definition natural numbers, i.e. positive integers.
gmatrant wrote:If x and y are prime numbers, what is the value of x+y ?
(1) x−y is a prime integer.
(2) y<x<6
Consider the following two examples,
  • x = 5 and y = 3 ---> (x - y) = 2 is prime integer ---> (x + y) = 8
    x = 5 and y = 2 ---> (x - y) = 3 is prime integer ---> (x + y) = 7
Both of the above examples satisfy both the statements but (x + y) has different values in both cases. Hence, both statements together is also not sufficient.

The correct answer is E.
Anurag Mairal, Ph.D., MBA
GMAT Expert, Admissions and Career Guidance
Gurome, Inc.
1-800-566-4043 (USA)

Join Our Facebook Groups
GMAT with Gurome
https://www.facebook.com/groups/272466352793633/
Admissions with Gurome
https://www.facebook.com/groups/461459690536574/
Career Advising with Gurome
https://www.facebook.com/groups/360435787349781/
Top
Post new topic Post Reply
• Page 1 of 1