GATE | GATE CS 1999 | Question 62

[5 Marks question]

a.  Show that the formula [(~p ∨ q) ⇒ (q⇒ p)] is not a tautology.

b.  Let A be a tautology and B be any other formula. Prove that (A ∨ B) is a tautology.

Answer:

Explanation:

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