Let S be the universal set, where: S = {1, 2, 3, ..., 18, 19, 20} Let sets A and B be subsets of S, where: Set A = {3, 4, 10, 11, 12, 16, 18} Set B = {4, 6, 7, 8, 9, 10, 12, 13, 14, 15, 18, 19, 20} Find the following: The number of elements in the set (A U B): n(A U B) = The number of elements in the set (A B) n(A B) is You may want to draw a Venn Diagram to help answer this question.