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

The factors of 15 are: 1, 3, 5, 15

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

The common factors are: 1, 3

  • The Greatest Common Factor (GCF) is: 3
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Q: What is the gcf of 12 15 and 21?
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