Never.
Of course not. In fact, the greatest common factor of two odd numbers is never 2.-- 2 is never a factor of any odd number.-- The greatest common factor of the odd numbers 651 and 1,085 is 217.
Yes.
Yes.
No. Odd numbers only have odd factors. They could not have an even factor in common.
Yes.
No, always odd.
The number will vary, but it will always be odd.
No.
True
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Yes, two odd numbers can have a greatest common factor of 1 if they have no factors in common. For example, 5 and 7 have a GCF of 1, as do 63 and 55.
No. Odd numbers don't have even factors.