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MHT CET2017MathematicsMathematical Reasoning

Which of the following statement pattern is a tautology?

Options

  1. Ap ∨ ( q → p )
  2. B∽ q → ∽ p
  3. Cq → p ∨ ∽ p ↔ q
  4. Dp ∧ ∽ p

Correct answer

C. q → p ∨ ∽ p ↔ q

Step-by-step solution

It can be done using truth or using rules of logic. (i) p ∨ q → p ≡ p ∨ ∽ q ∨ p ≡ p ∨ p ∨ ∽ q ≡ p ∨ ∽ q (ii) ∽ q → ∽ p ≡ q ∨ ∽ p (iv) p ∧ ∽ p ≡ F So left is (iii) p q q → p ∽ p ∽ p ↔ q q → p ∨ ∽ p ↔ q T T T F F T T F T F T T F T F T T T F F T T F T

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