If A={x: x is a multiple of 4} and B={x:x is a multiple of 6} then A⊂B consists of all multiples of
16
12
8
4
A=4, 8, 12, 16, 20, 24, ....
B=6, 12, 18, 24, 30, ...
∴A⊂B=12, 24, ...=x:x is a multiple of 12.