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The GCF of 3, 9, and 12 is 3.

Factors of 3 - 1 and 3

Factors of 9 - 1, 3, and 9

Factors of 12 - 1, 2, 3, 4, 6, and 12

The factors that they have in common are 1 and 3.

So the GCF, or Greatest Common Factor, is 3.

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9y ago

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