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Which of the following statement is correct? (a)p ∨ q ≡ q ∨ p

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Which of the following statement is correct?

(a) p ∨ q ≡ q ∨ p

(b) ¬(p ∧ q) ≡ ¬p ∨ ¬q

(c) (p ∨ q) ∨ r ≡ p ∨ (q ∨ r)

(d) All of mentioned

The question was asked at a job interview.

My doubt is from Logics in section The Foundation: Logics and Proofs of Discrete Mathematics

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The correct answer is (d) All of mentioned

Best explanation: Verify using truth table, all are correct.

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