Question

Choose the correct alternative:

Which of the following is always true?

विकल्प

• (p → q) ≡ ∼ q → ∼ p

• ∼ (p ∨ q) ≡ ∼ p ∨ ∼ q

• ∼ (p → q) ≡ p ∧ ∼ q

• ∼ (p ∨ q) ≡ ∼ p ∧ ∼ q

• ∼ (p → q) ≡ p ∧ ∼ q and ∼ (p ∨ q) ≡ ∼ p ∧ ∼ q

Answer 1

∼ (p → q) ≡ p ∧ ∼ q and ∼ (p ∨ q) ≡ ∼ p ∧ ∼ q