What is the greatest common divisor of positive

What is the greatest common divisor of positive integers m and n?
1) m is a prime number
2) 2n=7m

 

1)     Not possible to find the GCF :

e.g :

m   n        GCF

5   7          1

5    30        5

2)      2n = 7 * m.

M must be an even number to ensure that (m*7) = 2n.

So M = (2,4,6,8….even numbers)     

And N can be any Even or Odd number.

Insuff

Together:

Since m is prime and even. M should be = 2.

i.e. 2n = 14

n=7

GCF = 1

Ans :C