engineering recuitment GATE CSE 2023-24 Test Series Engineering Mathematics Mathematical Logic Propositional Logic

Which of the following statement is/are tautology?

1
P ⋁ ¬ P 
2
(P ⋀ Q) ⇒ P
3
(P ⇒ Q) ⋁ P 
4
(P ⋁ Q) ⇒ P

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