The least common factor of any set of positive integers is 1.
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The least common multiple of 15 , 20 , 35 = 420
105The least common multiple of 15 , 35 = 105
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 integers is 1.
The LCM of 35 and 105 is 105. Since 105 is a multiple of 35, it is automatically the LCM.