The least common factor of any set of numbers is 1. That's a little counter-intuitive. I'd be tempted to think it was -3, but common factors are defined as positive integers.
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The least common factor of 18, 27, 45 is 1. The least common factor of any set of numbers is 1.
The least common factor of any set of integers is 1.
The least common factor of any set of integers is 1.
The least common factor of any set of positive integers is 1.
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