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The complement of the set A is _____________

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The complement of the set A is _____________

(a) A – B

(b) U – A

(c) A – U

(d) B – A

I got this question in an international level competition.

I'm obligated to ask this question of Set Operations topic in section Basic Structures: Sets, Functions, Sequences, Sums and Matrices of Discrete Mathematics

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Correct choice is (b) U – A

For explanation: The complement of the set A is the complement of A with respect to U.

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