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Factors of 18 are 1, 18, 2, 9, 3, 6.

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

So, Common Factors of both are: 1, 2, 3, 6, and 18.

18 is the GCF.

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Q: What are the common factors of 18 and 72?
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