The least common factor is 1. (The least common factor of any two or more positive integers is always 1.)
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The least common factor is: 1
The LCM of 7, 21 and 35 is 105.
The LCM of 15, 21 and 35 is 105.
The common factor is 7.
the common factor of 35 ( I think) is 5 and 7