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All nonzero numbers have factors. Some numbers have some of the same factors as other numbers. These are called common factors. Some factors are positive numbers. Common factors which are positive numbers would be called positive common factors.
The least common factor is 1. (The least common factor of any two or more positive integers is always 1.)
The least common factor of any set of positive integers is 1.
The lowest common factor of any set of positive integers is 1.
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