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
Answer:D
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
Explanation: Verify using truth table, all are correct.