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Factors of 18 are: 1, 2, 3, 6, 9, 18

Factors of 24 are: 1, 2, 3, 4, 6, 8, 12, 24

Factors of 42 are: 1, 2, 3, 6, 7, 14, 21, 42

Since 6 is the highest number that will evenly divide into all three numbers, it is the greatest common factor, or GCF.

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15y ago

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