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One -- these numbers have no common factor except one, but that counts .It is the GCF.

Learn this: if there does not seem to be any factor in common, then the answer is one.

One is always a common factor and there are no others, it has to be the greatest.

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15y ago
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8y ago

The GCF of 2, 3, and 7 is 1. These are all prime numbers so have no common factor other than 1.

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9y ago

The GCF is 1.

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Q: What is the greatest common factor of 3 7 and 2?
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