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Let a set be A then A ∩ φ and A U φ are __________

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Let a set be A then  A ∩ φ and A U φ are __________

(a) φ, φ

(b) φ, A

(c) A, φ

(d) None of the mentioned

This question was addressed to me in an international level competition.

I would like to ask this question from Algebraic Laws on Sets topic in division Basic Structures: Sets, Functions, Sequences, Sums and Matrices of Discrete Mathematics

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The correct answer is (b) φ, A

Easy explanation: By Domination Laws on sets.

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