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The factors of 12 are 1, 2, 3, 4, 6, and 12.

The factors of 20 are 1, 2, 4, 5, 10, and 20.

The factors of 30 are 1, 2, 3, 5, 6, 10, 15, and 30.

The greatest factor they all have in common is 2.

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Q: What is the greatest common factor of 12 20 and 30?
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