Find all School-related info fast with the new School-Specific MBA Forum

It is currently 25 Oct 2014, 10:26

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.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

If n = p + r, where n, p, and r are positive integers and n

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Manager
Manager
User avatar
Joined: 21 Jun 2004
Posts: 240
Followers: 1

Kudos [?]: 1 [0], given: 0

If n = p + r, where n, p, and r are positive integers and n [#permalink] New post 25 Jun 2005, 21:59
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
If n = p + r, where n, p, and r are positive integers and n is odd, does p equal 2?
(1) p and r are prime numbers.
(2) r <> 2
Director
Director
User avatar
Joined: 18 Apr 2005
Posts: 551
Location: Canuckland
Followers: 1

Kudos [?]: 7 [0], given: 0

Re: FG - DS [#permalink] New post 25 Jun 2005, 22:28
forrestgump wrote:
If n = p + r, where n, p, and r are positive integers and n is odd, does p equal 2?
(1) p and r are prime numbers.
(2) r <> 2


1) insuff, one of them has to equal 2 but it can be either of them
2) insuff

together suff r<>2 => p =2 C
Director
Director
avatar
Joined: 27 Dec 2004
Posts: 908
Followers: 1

Kudos [?]: 12 [0], given: 0

 [#permalink] New post 26 Jun 2005, 13:20
What if n = 17?

Then if p and r are primes, combining both stmt 1 and 2,
r <> 2, then r + p = 17, 15 + 2 = 17
but then r(15) is not prime.

I say E.

Any thoughts?
VP
VP
User avatar
Joined: 13 Jun 2004
Posts: 1126
Location: London, UK
Schools: Tuck'08
Followers: 6

Kudos [?]: 25 [0], given: 0

 [#permalink] New post 26 Jun 2005, 17:22
C too :)
VP
VP
User avatar
Joined: 13 Jun 2004
Posts: 1126
Location: London, UK
Schools: Tuck'08
Followers: 6

Kudos [?]: 25 [0], given: 0

 [#permalink] New post 26 Jun 2005, 17:23
C too :)
Manager
Manager
User avatar
Joined: 04 Mar 2005
Posts: 107
Location: NYC
Followers: 2

Kudos [?]: 2 [0], given: 0

 [#permalink] New post 26 Jun 2005, 18:16
Folaa3 wrote:
What if n = 17?

Then if p and r are primes, combining both stmt 1 and 2,
r <> 2, then r + p = 17, 15 + 2 = 17
but then r(15) is not prime.

I say E.

Any thoughts?


Given:
N=P+R (from stem)
N = Odd (from stem)
Now, for N to be odd, either P or R shld be even and the other odd (E+O = O)
Also, P & R are prime (from S1)
Hence one of them shld be 2 (even prime)and the other an odd prime to satisfy the condn that N is odd.
To figure out which one of P & R is equal to 2, look at St2
St 2 : R <>2.
This implies that P has to be equal to 2
Hence 'C'
Senior Manager
Senior Manager
avatar
Joined: 30 May 2005
Posts: 374
Followers: 1

Kudos [?]: 6 [0], given: 0

Re: FG - DS [#permalink] New post 27 Jun 2005, 14:32
forrestgump wrote:
If n = p + r, where n, p, and r are positive integers and n is odd, does p equal 2?
(1) p and r are prime numbers.
(2) r <> 2


n = p + r, where n, p, and r are positive integers.

n is odd => p and r are (even,odd) or (odd,even)

S1 => p and r are prime. 2 is the only even Prime, so either p or r can be 2. But we don't know which is which. => Insufficient

S2 => r <> 2 => r can be 4 and p can be 5 or r can be 3 and p can be 2 etc. Infinite possibilities => Insufficient

S1 and S2 combined give us the fact that p=2.

C is my choice.
Re: FG - DS   [#permalink] 27 Jun 2005, 14:32
    Similar topics Author Replies Last post
Similar
Topics:
Experts publish their posts in the topic If n = p + r, where n, p, and r are positive integers and n abhi758 3 08 Apr 2010, 02:56
N=P+Q+R, P, Q, R are consecutive positive integers. N=X*Y*Z, Value 2 13 May 2008, 04:55
If n = p + r, where n, p, and r are positive integers and n el1981 3 06 May 2008, 09:50
N, R both are positive integer and permutations P(N,R) itishaj 3 03 Jun 2006, 02:45
N, R both are positive integer and permutations P(N,R) laxieqv 4 16 Jan 2006, 03:15
Display posts from previous: Sort by

If n = p + r, where n, p, and r are positive integers and n

  Question banks Downloads My Bookmarks Reviews Important topics  


cron

GMAT Club MBA Forum Home| About| Privacy Policy| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group and phpBB SEO

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.