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Manager
Joined: 20 Mar 2005
Posts: 170
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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: 1564
Followers: 4
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63
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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
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Manager
Joined: 20 Mar 2005
Posts: 170
Followers: 2
Kudos [?]:
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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?
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VP
Joined: 28 Mar 2006
Posts: 1396
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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 
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CEO
Joined: 29 Aug 2007
Posts: 2530
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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.
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CEO
Joined: 29 Mar 2007
Posts: 2618
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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
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SVP
Joined: 05 Jul 2006
Posts: 1564
Followers: 4
Kudos [?]:
63
[0], given: 34
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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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