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The factors of 45 are: 1, 3, 5, 9, 15, 45

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

The common factors are: 1, 3, 9

The Greatest Common Factor (GCF) is: 9

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Q: What is the largest common factor of 72 and 45?
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