In following question find A ( B.
1. A = {1, 2, 4, 5} and B = {2, 3, 4, 5}
2. A = {a, e, i, o, u} and B = {a, b, c, d}
3. A = ( and B = {1, 2, 3, 4}
4. A = {x: x is a natural number greater than 5} and
B = {x: x is a natural number less than 5}