21 and 25 share no common factors aside from 1.
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The factors of 24 are 1,2,3,4,6,8,12 and 24. For them to be common, they need to be compared to another set of factors.
The common factors of 25 and 50 are 1, 5 and 25.All of them.
The common factors of 75 and 100 are 1, 5 and 25.
The common factors of 13612 and 24 are: 1, 2, and 4
The factors of 7 are 1, 7 The factors of 25 are 1, 5, 25 → The common factor(s) of 7 and 25 is (are): 1 → greatest common factor is 1.