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 = {1, 3, 4, 5, 6, 12, 16, 17, 20} Set B = {2, 3, 4, 6, 9, 10, 16} Find the following: LIST the elements in the set (A U B): =_} Enter the elements as a list, separated by commas. If the result is the empty set, enter DNE You may want to draw a Venn Diagram to help answer this