It is NEVER even. Because no even number can be a factor of the odd number.
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It CAN'T be even, since the number 2 is not a factor of the odd number. "Even" means that a number is a multiple of 2.
Because odd numbers don't have any even factors so they can't have any in common.
Not sure what the GFC is but if you meant GCF, the answer is no, it is never even.
Yes and yes.
no, the GCF for 4 and 2 would be 2, which is even