GCEFurther MathematicsSets and Binary Operations2019

If the universal set U = {1, 2, 3, 4, 5, 6, 7, 8} and A = {2, 4, 6, 8}, find A' (the complement of A).

A{1, 3, 5, 7}CORRECT
B{2, 4, 6, 8}
C{1, 2, 3, 4, 5, 6, 7, 8}
D{}
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Why the answer is A, and why the others tempt you.
The complement A' consists of all elements in the universal set U that are NOT in A. Removing {2, 4, 6, 8} from U = {1, 2, 3, 4, 5, 6, 7, 8} leaves {1, 3, 5, 7}. Option B is A itself, option C is U, and option D is the empty set.
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