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

It is currently 23 Nov 2014, 21:17

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

Is the positive integer r an even number? (1) r is a prime

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Manager
Manager
User avatar
Joined: 04 Jan 2008
Posts: 120
Followers: 2

Kudos [?]: 17 [0], given: 0

Is the positive integer r an even number? (1) r is a prime [#permalink] New post 05 Sep 2008, 02:44
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
Is the positive integer r an even number?

(1) r is a prime number
(2) 3 < r < 26
SVP
SVP
avatar
Joined: 21 Jul 2006
Posts: 1551
Followers: 8

Kudos [?]: 248 [0], given: 1

Re: Zumit - DS - 002 [#permalink] New post 05 Sep 2008, 03:22
The answer is C.


Here is a list of prime numbers:

2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, etc...

Basically, a prime number is a number that has only 2 distinct factors. 1 is not prime because although you can use 1 *1 to get the product of 1, these 2 factors are not distinct. With 2, you have 2*1. With 3, you have 3*1. Prime numbers are numbers that can be divided only by 1 and itself. Another point to remember here is that 2 is the ONLY even prime. All the other prime numbers are odd.

So in statement 1, a prime number could mean 2 or any odd numbers.

In statement 2, any integers between 3 and 26 could include any of the even integers or odd integers.

Together, since the numbers between 3 and 26 are prime numbers, you know for sure that 2 is not between these values, so the number must be odd.

C

Last edited by tarek99 on 06 Sep 2008, 03:59, edited 1 time in total.
VP
VP
avatar
Joined: 17 Jun 2008
Posts: 1406
Followers: 7

Kudos [?]: 128 [0], given: 0

Re: Zumit - DS - 002 [#permalink] New post 05 Sep 2008, 21:48
dancinggeometry wrote:
Is the positive integer r an even number?

(1) r is a prime number
(2) 3 < r < 26


IMO C
(1)INSUFFI , cannot say since 2 is even prime number and others are odd
(2)r can be any number in between ,even or odd INSUFFI

(1) and (2) since >3 ,all the prime numbers are odd hence r cannot be
even hence answers !!! SUFFI
IMO C
_________________

cheers
Its Now Or Never

Re: Zumit - DS - 002   [#permalink] 05 Sep 2008, 21:48
    Similar topics Author Replies Last post
Similar
Topics:
1 Experts publish their posts in the topic if | r | != 1 is integer r even 1 r is not positive 2 2r rxs0005 10 14 Aug 2010, 03:38
If r and s are positive integers, r is what % of s (1) r saurabhkowley18 2 29 Apr 2008, 17:31
If r and t are positive integers, is rt even? avenger 7 02 Oct 2007, 12:30
If r, s, and t are positive integers, is r + s + t even? (1) gluon 5 15 Sep 2007, 14:46
s and r are positive integers, is either r or s a prime? 1) sparky 6 31 May 2005, 02:41
Display posts from previous: Sort by

Is the positive integer r an even number? (1) r is a prime

  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®.