Factors of 21: 1, 3, 7, 21
Factors of 60: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60
GCF (21, 60) = 3
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The greatest common factor of 31 and 46 is 1.
It is: 1
The greatest common factor of 61 , 121143 = 1
It is just 1
The GCF is 1.