65
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All three have eight factors.
Prime factors of 42 are: 2, 3 and 7 Prime factors of 237 are: 3 and 79
The factors of 21 are: 1, 3, 7, 21.The factors of 42 are: 1, 2, 3, 6, 7, 14, 21, 42.The common factors are: 1, 3, 7, 21
The common factors are: 1, 2
Factors of 28... 1,2,4,7,14,28 Factors of 42... 1,2,3,6,7,14,21,42 GCF = 14