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To find the greatest common factor (GCF) of 27, 63, and 108, we first need to find the prime factors of each number. The prime factors of 27 are 3 x 3 x 3, the prime factors of 63 are 3 x 3 x 7, and the prime factors of 108 are 2 x 2 x 3 x 3 x 3. The GCF is the product of the common prime factors raised to the lowest power they appear in all the numbers, which in this case is 3 x 3 = 9. Therefore, the greatest common factor of 27, 63, and 108 is 9.

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Q: What is the greatest common factor of 27 63 and 108?
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