The GCF of 14, 66, 96 and 102 is 2.
The GCF can't be greater than 14. 14 is not a factor of any of the other numbers. 14's factors are 2 and 7. Of these, only 2 is a factor of the others, so it is the GCF.
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The greatest common factor (GCF) refers to a factor that is COMMON to two or more numbers. You have only one number in the question! The greatest factor of any number is itself.