In following question find A ( B.
1. A = {2, 3, 4, 5, 6} and B = {4, 6, 8, 10, 12}
2. A = {a, b, c, d, e} and B = {a, d, e, f, g, h}
3. A = ( and B = {x, y, a, b}
4. A = {x: x is a natural number less than 4} and
B = {3, 4, 5, 6}