2 and 6.
The greatest common factor is 6.
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3 is the greatest common factor of 42 and 99.
The greatest common multiple of any set of integers is infinite.
Most Common Factor, Greatest Common Factor, Highest Common Factor... all the same thing.
There is no "common factor" of 350, to have a common factor you must have more than one number, so there is no common factor of 350.
2 is a common factor.