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

Redeem

GMATPrep DS 33

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Newbie | Next Rank: 10 Posts
Posts: 4
Joined: Sun Jan 27, 2008 3:25 pm
Location: Toronto

GMATPrep DS 33

by parisfr67 » Mon Jan 28, 2008 5:34 pm
Question comes from GMATPrep#1 DS#33 -- See attached file for question

what is the val for p?
(1) p/4 is PRIME ...
PRIME are 2,3,5,7,11,13,17,19, etc ... having no factor except itself and one .. How can anything be divided by four and be a prime number .. NOT SUFF

(2) p is divisible by 3 ... Many numbers divisible by 3 ... NOT SUFF

Together:
p is div by 3 and p/4 is PRIME ... I see a contradiction with the definition of prime numbers ... Hence my answer of E

Correct Answer is C ... Can someone explain to me how p/4 is PRIME given p is divisible by 3

regards
Alain
Attachments
quant-q33.JPG
Top
Source: — Data Sufficiency |
Junior | Next Rank: 30 Posts
Posts: 15
Joined: Mon Oct 29, 2007 12:43 pm
Thanked: 2 times

Re: GMATPrep DS 33

by stellategang » Mon Jan 28, 2008 6:52 pm
parisfr67 wrote: what is the val for p?
(1) p/4 is PRIME ...
PRIME are 2,3,5,7,11,13,17,19, etc ... having no factor except itself and one .. How can anything be divided by four and be a prime number .. NOT SUFF

I think you're reading 1 incorrectly. Statement 1 is not saying that p is prime but that the expression (p/4) is a PRIME. So for example (28/4) = 7 is prime (i.e. 7) but notice that (12/4) = 3 is a prime too (i.e. 3) . So in this interpretation 1 is INSUFF because (p/4) could equal 7 or 3 depending on p.

(2) p is divisible by 3 ... Many numbers divisible by 3 ... NOT SUFF

TRUE

Together:
p is div by 3 and p/4 is PRIME ... I see a contradiction with the definition of prime numbers ... Hence my answer of E

Correct Answer is C ... Can someone explain to me how p/4 is PRIME given p is divisible by 3

The only value for p where the expression (p/4) is prime AND p is divisible by three is the value of 12, where p = 12.

ANSWER IS C

hope that helps? . . . looks like you just misread statement 1? :)

regards
Alain
Top
User avatar
GMAT Instructor
Posts: 3225
Joined: Tue Jan 08, 2008 2:40 pm
Location: Toronto
Thanked: 1710 times
Followed by:614 members
GMAT Score:800

by Stuart@KaplanGMAT » Tue Jan 29, 2008 10:58 am
Stellategang evaluated your situation perfectly - you've completely misinterpreted both the question and statement (1).

A good tip for test day is that if you look at a statement and it seems like it's impossible, then you KNOW that you've misinterpreted something. "Impossible" is NOT the same thing as "insufficient".

In fact, NO statement on the GMAT will lead to an impossible situation. There has to be at least one solution to every question asked.
Image

Stuart Kovinsky | Kaplan GMAT Faculty | Toronto

Kaplan Exclusive: The Official Test Day Experience | Ready to Take a Free Practice Test? | Kaplan/Beat the GMAT Member Discount
BTG100 for $100 off a full course
Top
Post new topic Post Reply
• Page 1 of 1