It is currently 11 Dec 2018, 20:18
My Tests

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.

GRE Math Challenge #44-prime number greater than 2

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 07 Jun 2014
Posts: 4749
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 93

Kudos [?]: 1654 [0], given: 396

CAT Tests
GRE Math Challenge #44-prime number greater than 2 [#permalink] New post 09 Sep 2014, 03:33
Expert's post
00:00

Question Stats:

53% (00:43) correct 46% (00:22) wrong based on 13 sessions
If n is any prime number greater than 2, which of the following CANNOT be a prime number?

A. n-4
B. n-3
C. n-1
D. n+2
E. n+5


[Reveal] Spoiler: Explanation
All primes greater than 2 are odd;
So, n-4 is odd and can be prime but take n=6 gives n-4=2 is prime
n-3 could be even ie prime
n-1 sameway as above is prime
n+2 is odd and can be prime as the case is in 41, 43 & 11, 13 etc
n+5 is always even for all odds greater than 2 and hence is the answer
[Reveal] Spoiler: OA

_________________

Sandy
If you found this post useful, please let me know by pressing the Kudos Button

Try our free Online GRE Test

Manager
Manager
Joined: 03 Dec 2017
Posts: 65
Followers: 0

Kudos [?]: 15 [0], given: 20

Re: GRE Math Challenge #44-prime number greater than 2 [#permalink] New post 15 Jan 2018, 20:28
A? because 3-4==-1
it is less than 0? please explain, thanks
Manager
Manager
Joined: 29 Nov 2017
Posts: 190
Location: United States
GRE 1: Q142 V146
WE: Information Technology (Computer Software)
Followers: 0

Kudos [?]: 77 [0], given: 99

Re: GRE Math Challenge #44-prime number greater than 2 [#permalink] New post 09 May 2018, 08:20
I solved the question by taking the n as 3.

as we know NEGATIVE number can not be PRIME. hence according to my N option A and B are out of choice and option C and D is prime and hence E is the answer.
Re: GRE Math Challenge #44-prime number greater than 2   [#permalink] 09 May 2018, 08:20
Display posts from previous: Sort by

GRE Math Challenge #44-prime number greater than 2

  Question banks Downloads My Bookmarks Reviews Important topics  


cron

GRE Prep Club Forum Home| About| Terms and Conditions and Privacy Policy| GRE Prep Club Rules| Contact

Powered by phpBB © phpBB Group

Kindly note that the GRE® test is a registered trademark of the Educational Testing Service®, and this site has neither been reviewed nor endorsed by ETS®.