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The factors of the numbers are

12: 1, 2, 3, 4, 6, and 12

15: 1, 3, 5, and 15

30: 1, 2, 3, 5, 6, 10, 15, and 30

The GCF of the three numbers is the largest number that is a factor of all three numbers, which is 3.

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Q: What is the greatest common factor of 12 15 and 30?
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