bkpolymers1617 wrote:

M is a positive integer, what is the greatest common factor of M and 64?

(1) No two different factors of M sum to a prime number.

(2) The greatest common factor of M and 2,310 is 165.

Statement 1: every no has 1 as a factor. as per this statement M does not contain 2 because in that case 1+2=3=prime number and its given summations of no two different factors of M are prime. So it can be concluded that M is odd. Hence Greatest common factor of M & 64 will be 1.

SufficientStatement 2: 2310=2*3*5*7*11 and 165 = 3*5*11. As 165 is GCF of M & 2310, it is evident that M does not contain 2, so M has to be odd.

Hence GCF of M & 64 is 1.

SufficientOption

D