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All of the factors of A.
The common factors of 25 and 50 are 1, 5 and 25.All of them.
The factors of 64 are all 2s and the factors of 81 are all 3s. The greatest common factor is 1, since they have no factors in common. ■
When you are finding common factors, one method is to list the factors.
The common factors are: 1, 2