The next number in the series 4, 12, 6, 12, 36, 18, 36
The next number in the series 4-12-6-12-36-18-36.. is 108.
108
108
108
108
108
10 thought it was 108
81
12 because they are decreasing by increments of 6
Oh, dude, the least common multiple of 12, 18, and 36 is like the smallest number that all of them can divide into evenly. So, you just gotta find the smallest number that 12, 18, and 36 can all be divided by without leaving a remainder. It's like finding the smallest party all three of them can attend without any drama. And that magic number is 36.
It is 36*6/12 = 18