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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.
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