Since odd numbers don't have any even factors, they can't have any in common.
Yes, the least common multiple of two numbers is always divisible by those numbers' greatest common factor.
No.
Yes, the greatest common factor of two different prime numbers is always 1
Yes.
No. The greatest common factor of any two or more numbers is always the single highest common factor.
The greatest common factor of two numbers has to show up on the lists of factors of both numbers.
yes
Yes.
It will always be 1.
Yes.
No.
Always even.