Gmat prep DS : DS Archive
Check GMAT Club Decision Tracker for the Latest School Decision Releases http://gmatclub.com/AppTrack

 It is currently 18 Jan 2017, 22:09

### 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

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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# Gmat prep DS

 post reply Question banks Downloads My Bookmarks Reviews Important topics
Author Message
Manager
Joined: 20 Mar 2005
Posts: 170
Followers: 2

Kudos [?]: 71 [0], given: 0

Gmat prep DS [#permalink]

### Show Tags

07 Nov 2007, 04:51
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions

### HideShow timer Statistics

This topic is locked. If you want to discuss this question please re-post it in the respective forum.

please explain this ..i dont have the OA.
Attachments

Ppt0000000.jpg [ 24.96 KiB | Viewed 681 times ]

SVP
Joined: 05 Jul 2006
Posts: 1743
Followers: 6

Kudos [?]: 316 [0], given: 49

### Show Tags

07 Nov 2007, 11:22
if m is prime

then highet divisor might be either m or 1 given that n is not prime and n is a multiple of m...............insuff

from 2

m = 2/7n,,,,,,,,,n is a mutliple of 7 and m is even........insuff

both

m = 2 and n = 7x.........insuff, devisor could be 1 or 2.

I say E
Manager
Joined: 20 Mar 2005
Posts: 170
Followers: 2

Kudos [?]: 71 [0], given: 0

### Show Tags

07 Nov 2007, 15:11
From A and B together

A says m is prime....2, 3, 5, 7

from B m = 2n/7

B says m Even so only number for m can be 2
and n =7

so GCD can be 1

Is it Ok or am i missing something?
VP
Joined: 28 Mar 2006
Posts: 1381
Followers: 2

Kudos [?]: 31 [0], given: 0

### Show Tags

07 Nov 2007, 18:10
yezz wrote:
if m is prime

then highet divisor might be either m or 1 given that n is not prime and n is a multiple of m...............insuff

from 2

m = 2/7n,,,,,,,,,n is a mutliple of 7 and m is even........insuff

both

m = 2 and n = 7x.........insuff, devisor could be 1 or 2.

I say E

Longtime welcome back
SVP
Joined: 29 Aug 2007
Posts: 2492
Followers: 67

Kudos [?]: 734 [0], given: 19

### Show Tags

07 Nov 2007, 19:29
Balvinder wrote:
From A and B together

A says m is prime....2, 3, 5, 7

from B m = 2n/7

B says m Even so only number for m can be 2
and n =7

so GCD can be 1

Is it Ok or am i missing something?

You are ok. it should be C since m is a prime and 2n = 7m, the common divisor is 1.
CEO
Joined: 29 Mar 2007
Posts: 2583
Followers: 19

Kudos [?]: 421 [0], given: 0

Re: Gmat prep DS [#permalink]

### Show Tags

07 Nov 2007, 22:28
Balvinder wrote:
please explain this ..i dont have the OA.

Stem is asking for GCF of N and M. Also important to note that N and M are integers.

S1: M= prime #, no help.

S2: 2N=7M --> N=7/2M Since N is an integer M MUST be divisible by 2. The opposite is true for N, b/c M=2N/7 N must be divisble by 7.

However, as u can see N and M can be anything so long as they fit this criteria. Insuff.

B/c M is prime and must be divisible by 2, then M must be 2.

So N=7. GCF is 1.

C
SVP
Joined: 05 Jul 2006
Posts: 1743
Followers: 6

Kudos [?]: 316 [0], given: 49

### Show Tags

07 Nov 2007, 22:54
Hi Trivi been a long time , i was reallocated to another country and i had to put my MBA plans on hold for a while.

Guys You are right n = 7 , the moral is ..........never try to solve tricky GMAT late at night after working for 14 hours.
07 Nov 2007, 22:54
Display posts from previous: Sort by

# Gmat prep DS

 post reply Question banks Downloads My Bookmarks Reviews Important topics

 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®.