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Which one of the following statements is not a tautology ?

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Which one of the following statements is not a tautology ?

(1)  P → (p ∨ q)

(2)   (p ∧ q) → (~p) ∨ q

(3)  (p  ∧ q) → p 

(4)   (p ∨ q) → (p) ∨ (~q) 

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1 Answer

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Best answer

Correct option  (4)   (p ∨ q) → (p) ∨ (~q) 

Explanation:

P q p V q ∨ q p ∨ ~q  (P ∨ q) → (p) ∨ (~q) 
T T T F T T
T F T T T T
F T T F F F
F F F T T T
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