GATE | GATE CS 1997 | Question 17

Which of the following propositions is a tautology?

a. (p ∨ q) → p
b. p ∨ (q → p)
c. p ∨ (p → q)
d. p → (p → q)
(A) a
(B) b
(C) c
(D) d

Answer: (C)


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