If gcd(m,n)=d>1\gcd(m, n) = d > 1gcd(m,n)=d>1, which of the following must be true?
gcd(km,kn)=kd\gcd(km, kn) = kdgcd(km,kn)=kd for any positive integer kkk
gcd(2m,2n)=2d\gcd(2m, 2n) = 2dgcd(2m,2n)=2d
If ddd divides 12, then gcd(2m,2n)\gcd(2m, 2n)gcd(2m,2n) divides 24
gcd(m+n,m−n)=d\gcd(m+n, m-n) = dgcd(m+n,m−n)=d