Explanation:
3, 6, 8, 12, 15, 18
18 is the sixth number in the 3 times table and 3 is the first. You then make it into its simplest form. 18-6 and 3-1
I don't know if that is helpful at all but I don't really know how else to explain it.
Answer:
6+6+6=18 1+1+1+1+1+1=6
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