1) There isn't such a thing as a least common factor. If you really wanted to know, it is always 1. 2) You can't have something in common between only one thing. greatest common factor and least common multiple require you to compare two numbers.
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The least common factor is 1 but the highest common factor is 4
The least common factor of any set of integers is 1.
The least common factor is 1. (The least common factor of any two or more positive integers is always 1.)
Least common factor is always 1. If you meant least common multiple, it would be 140. If you meant greatestcommon factor, it would be 4.
The least common factor of any two numbers is always one. The greatest common factor of these two is 4. The least common multiple is 120.