Because the GCF is the largest factor common to all the numbers in the sample. The LCM is the smallest number that all the sample numbers will divide into !
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GCF - Greatest Common Factor (GCF is always smaller or equal to at least one of the numbers) LCM - Least Common Multiple (LCM is always greater or equal to at least one of the numbers)
Hardly ever.
Not sure what the GFC is but if you meant GCF, the answer is no, it is never even.
It is NEVER even. Because no even number can be a factor of the odd number.
Yes and yes.