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The GCF of 42 and 51 is 3.
3
The GCF is 17.
The GCF is 1.
The GCF is 21.
255 = 51 x 5 so 51 is GCF
1
The GCF is 3.
The GCF is: 27
The GCF of 1218 and 42 is 42. The GCF of 12, 18 and 42 is 6.