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# Gmat prep DS

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Manager
Joined: 20 Mar 2005
Posts: 170
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Kudos [?]: 27 [0], given: 0

Gmat prep DS [#permalink]  07 Nov 2007, 04:51
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
please explain this ..i dont have the OA.
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SVP
Joined: 05 Jul 2006
Posts: 1516
Followers: 5

Kudos [?]: 127 [0], given: 39

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 [?]: 27 [0], given: 0

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: 1383
Followers: 2

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

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: 2493
Followers: 59

Kudos [?]: 577 [0], given: 19

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: 2585
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Re: Gmat prep DS [#permalink]  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: 1516
Followers: 5

Kudos [?]: 127 [0], given: 39

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.
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