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The GCF of 42 and 51 is 3.
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The factors of 51 are: 1, 3, 17, 51The factors of 75 are: 1, 3, 5, 15, 25, 75The factors of 81 are: 1, 3, 9, 27, 81The common factors are: 1, 3The Greatest Common Factor (GCF) is: 3
The GCF of 6 and 81 is 3.
The GCF is 9.