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The common factors of 6, 21, and 39 are 1 and 3
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
There are only two common factors for 56 and 21. They are 1 and 7.
The common factors are: 1, 3
The factors of 21 are: 1, 3, 7, 21.The factors of 33 are: 1, 3, 11, 33.The common factors are: 1, 3The GCF is: 3