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