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Excluding 1, they are : 2 , 3, 6, 14, 21, and 42.

42 = 2 x 3 x 7

84 = 2 x 2 x 3 x 7

the multiple factors are 2 x 7, 3 x 7, and 2 x 3 x 7 (which is 42).

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13y ago
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8y ago

Since 42 is a factor of 84, all of its factors are common.

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8y ago

The common factors are 1, 2, 3, 6, 7, 14, 21 and 42.

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Q: What are the common factors of 84 and 42?
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To find the greatest common factor (GCF) of 42, 72, and 84, you first need to find the factors of each number. The factors of 42 are 1, 2, 3, 6, 7, 14, 21, and 42. The factors of 72 are 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, and 72. The factors of 84 are 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, and 84. The GCF of 42, 72, and 84 is the largest number that appears in the factors of all three numbers, which in this case is 6.


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