Q. (i) If U = {0: $\le$x $\le$10, x $\in$ W} and A = {x:x is a multiple of 3}, find A'.
    (ii) If U is the set of natural numbers and A' is the set of all composite numbers, then what is A?


If U = {a,b,c,d,e,f,g,h}, A = {​a,b,c,d} and B = {b,d,f,g}.