document.write( "Question 453659: Given U = {10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20}, A = {12, 14, 16, 18, 20}, and B = {11, 13, 14, 15, 18, 19, 20}. \r
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Algebra.Com's Answer #311673 by ilana(307)\"\" \"About 
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A' contains the elements that are in U but not A.
\n" ); document.write( "A' = {10, 11, 13, 15, 17, 19}
\n" ); document.write( "B' contains the elements that are in U but not B.
\n" ); document.write( "B' = {10, 12, 16, 17}
\n" ); document.write( "Their intersection contains the elements in both.
\n" ); document.write( "A′ ∩ B′ = {10, 17}
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