1 and 3
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The only common factor of all three numbers is 3. (The numbers 21 and 63 share all of the factors of 21 : 1, 3, 7, and 21.)
The common factors of 12 and 14 are 1 and 21 and 2
The common factors are: 1, 3
21 and 25 share no common factors aside from 1.
The factors of 21 are:1, 3, 7, 21The factors of 350 are:1, 2, 5, 7, 10, 14, 25, 35, 50, 70, 175, 350The common factors are:1, 7