Need assistance please

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, 5, 9, 14, 15, 16, 17, 19, 20} Set B = {1, 2, 3, 4, 5, 7, 9, 10, 15, 16, 17, 20} Find the following: LIST the elements in the set (A U B): (AUB) = { Enter the elements as a list, separated by commas. If the result is the empty set, enter DNE LIST the elements in the set ( A ri B): (An B) = [ Enter the elements as a list, separated by commas, If the result is the empty set, enter ONE You may want to draw a Venn Diagram to help answer this