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The statement among the following that is a tautology is : (1) A ∧ (A ∧ B) (2) A ∧(A ∧ B) (3) B → [A ∧(A → B)] (4) [A ∧ (A → B)] → B

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The statement among the following that is a tautology is :

(1) A ∧ (A ∧ B)

(2) A ∧(A ∧ B) 

(3) B → [A ∧(A → B)]

(4) [A ∧ (A → B)] → B

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Correct Answer is (4) [A ∧ (A → B)] → B


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