The lowest common factor of any set of integers is 1.
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It is: 30
The lowest common factor of any set of positive integers is 1.
LCM(5, 6, 8, 10) = 120.
The lowest common factor of 6 and 15 is 1. However, I suspect you either want their lowest common multiple (ie the smallest number into which both 6 and 15 divide) or their highest common factor (the largest number which will divided into both 6 and 15). LCM: 6 = 2 x 3 15 = 3 x 5 LCM = 2 x 3 x 5 = 30 HCF: 6 = 2 x 3 15 = 3 x 5 HCF = 3.
The lowest common factor refers to a comparison between at least two sets of factors. There is no LCF of a single number like 6. That being said, the answer is 1, because the LCF for 6 and any other number is 1.