Hi,

U = {10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20}, 

A = {12, 14, 16, 18, 20}, A' = {10,11,13,15,17,19}

B = {11, 13, 14, 15, 18, 19, 20}, B' = {10,12,16,17}

                               A′ ∩ B' = {10,17}

 

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