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The factors of 28 are 1, 2, 4, 7, 14, and 28.

The factors of 72 are 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, and 72.

The common factors are 1, 2, and 4.

The greatest common factor is 4.

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Q: What are common factors of 28 and 72?
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