The GCF of 14 and 21 is 7.
The factors of 14 are: 1, 2, 7, 14
The factors of 21 are: 1, 3, 7, 21
The common factors are: 1, 7.
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The Greatest Common Factor of 21, 24, 14: 1
The Greatest Common Factor of 60, 14, 21: 1
The GCF is 1.
The greatest factor of 21 and 16 is 21, which is a factor of 21 but not of 16.
7 and 14