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Well, isn't that just a happy little math question? Let's find the Greatest Common Factor (GCF) of 72 and 170. The factors of 72 are 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, and 72. The factors of 170 are 1, 2, 5, 10, 17, 34, 85, and 170. The largest number that appears in both lists is 2, so the GCF of 72 and 170 is 2.
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