Understanding Sets and Subsets of Real numbers

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SOLVED: 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 = 4 , 7 , 8 , 9 , 10 , 13 , 16 Set B = 2 , 3 , 4 , 5 , 8 , 10 , 11 , 18 , 20 Find the following:LIST the elements in the set ( A ∪ B ): ( A ∪ B ) = Enterthe elements as a list, separated by commas. If the result is theempty set, enter DNELIST the elements in the set ( A ∩ B ): ( A ∩ B ) = Enter the elements as a list, separated by commas. If the result isthe empty s