1.

Which of the following is a tautology?(a) p ⇒ (q ∨ ~ q)(b) p ⇔ (~q ∧ p)(c) p ⇔ (p ∧ ~ p)(d) (p ∧ ~ p) ∧ q

Answer» Which of the following is a tautology?

(a) p (q ~ q)

(b) p (~q p)

(c) p (p ~ p)

(d) (p ~ p) q


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