solve it

Let be the universal set, where: S = {1,2,3,...,18,19, 20} Let sets A and B be subsets of S, where: Set A = {1,4,5, 6, 7,8, 10,11, 13, 15,17, 19, 20} Set B = {2,4,5, 6, 7, 8, 9, 11, 12, 16} Find the following: The number of elements in the set (AU B): n(AU B) =| | The number of elements in the set (AM B): n(AN B)is| | You may want to draw a Venn Diagram to help answer this