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The greatest common factor for 12, 18, and 30 is 6.
The factors of 12 are 1, 2, 3, 4, 6, and 12
The factors of 18 are 1, 2, 3, 6, 9, and 18
The factors of 30 are 1, 2, 3, 5, 6, 10, 15, and 30
Thus, GCF (12, 18, 30) = 6
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