The LCF of any pair of numbers is always 1, since it is the lowest number that can be a factor and is a trivial factor of all numbers. The least common factor of any set of numbers is 1.
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The GCF is 15. The LCM is 60.
The least common factor is: 1
The least common multiple of the numbers 12, 15 and 6 is 60.
The least common factor of any set of numbers is 1.
Since 15 is a factor of 60, it is automatically the GCF of this problem.