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1 is a factor of every nonzero number, so 42 would have it in common with any other number.

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12y ago
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11y ago

1, 2, 3, and 6 are all common factors of 12 and 42.

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Q: Is 1 common factor of 42?
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The GCF is 1.


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The GCF of 42 and 86 is 2. One way to determine the common factors and greatest common factor is to find all the factors of the numbers and compare them. The factors of 42 are 1, 2, 3, 6, 7, 14, 21, and 42. The factors of 86 are 1, 2, 43, and 86. The common factors are 1 and 2. Therefore, the greatest common factor is 2.