What is the GCF of 81 and 63?
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The factors of 63 are 63, 21, 9, 7, 3, 1. The common factors of 81 and 63 are 9, 3, 1, intersecting the two sets above. In the intersection factors of 81 ∩ factors of 63 the greatest element is 9. Therefore, the greatest common factor of 81 and 63 is 9.
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