1, 2, 7, and 14.
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The common factors of 14 and 28 are 14,7,2,1.
The factors of 14 are 1, 2, 7, and 14. The factors of 28 are 1, 2, 4, 7, 14, and 28. The common factors of 14 and 28 are 1, 2, 7, and 14. Therefore, the least (smallest) common factor is 1.
Common factors of 42 and 28 are: 1, 2, 7, and 14.
Common factors of 126 and 28 are: 1, 2, 7, and 14.
The common factors are: 1, 2, 4, 7, 14, 28