Given the universal set U = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, A = {2, 4, 6, 8, 10} and B = {1, 2, 3, 4, 5}, find (A ∪ B)'.
A{6, 7, 8, 9, 10}
B{7, 9}CORRECT
C{2, 4}
D{1, 3, 5, 6, 7, 8, 9, 10}
GCEMathematicsSets and Logic2019
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Why the answer is B, and why the others tempt you.
First, A ∪ B = {1, 2, 3, 4, 5, 6, 8, 10}. The complement (A ∪ B)' contains elements in U but not in A ∪ B, which are {7, 9}.
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