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by gbb » Thu Apr 02, 2009 12:27 pm
What is the greatest common divisor of positive integers m and n?
(1) m is a prime number
(2) 2n = 7m

help!!!

answer C
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Source: — Data Sufficiency |
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by GID09 » Thu Apr 02, 2009 12:42 pm
St 1 m is prime, no data about n, Insufficient
St 2 2n = 7m, m & n could be any numbers, Insufficient.

Both st 1 & 2 combined tell us m=2 as none of the other prime numbers satisfy the two condictions. Hence m=2, n= 7 and GCF = 1, Ans C
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