1, 2, 7 and 14
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The common factors of 21 42 and 84 are 21
The common factors of 78 and 84 are 1, 2, 3 and 6.
The common factors of 98 and 14 are: 1, 2, 7, and 14
40 and 98 have no common factors.
Common factors of 24, 48, and 84 are: 1, 2, 3, 4, 6, and 12.