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The factors of 12 are: 1, 2, 3, 4, 6, 12

The factors of 21 are: 1, 3, 7, 21

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

The common factors are: 1, 3

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Q: What are the common factors of 12and 21and 30?
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