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B
{1,3,4}
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C
{1,2,3,4,5}
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D
ϕ
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Solution
The correct option is B{1,3,4} The complement of a set A is the set of all elements in the universal set U which are not in A.
Thus, if U={1,2,3,4,5} and A={2,5}, then the elements 1, 3 and 4 are the only elements of U which are not in A. ⟹A′={1,3,4}