The Lowest Common Factor of ANY set of numbers is 1 - it is the smallest positive integer that divides exactly into each of the numbers which will always be 1.
Perhaps you meant either:
HIGHEST Common Factor - the greatest integer which divides exactly into each of the numbers; HCF(5, 7, 10) = 1
However, I suspect that you really wanted the Lowest Common MULTIPLE which is the smallest number into which all the numbers divide exactly; LCM(5, 7, 10) = 70.
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The lowest common factor of any set of positive integers is 1.
The factors of 5 are: 1, and 5The factors of 10 are: 1, 5, and 10The factors common to 5 and 10 are: 1, and 5The greatest common factor is 5.
The lowest common factor of any set of integers is 1.
The least common factor of any set of integers is 1.
As stated, this question does not appear to be particularly useful. The lowest common factor of the numbers is 1. The lowest common MULTIPLE of the three numbers, which could be of use, is 30.