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The greatest common factor (GCF) of 27 and 189 is 27. To find the GCF, you can list the factors of each number and find the largest number that both 27 and 189 share. The factors of 27 are 1, 3, 9, and 27, while the factors of 189 are 1, 3, 7, 9, 21, 27, 63, and 189. The largest number that appears in both lists is 27, making it the GCF.
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