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JEE Main202116 Mar 2021Morning ShiftMathematicsMathematical ReasoningActual

Which of the following Boolean expression is a tautology ?

Options

  1. Ap ∧ q ∨ p ∨ q
  2. Bp ∧ q ∨ p → q
  3. Cp ∧ q ∧ p → q
  4. Dp ∧ q → p → q

Correct answer

D. p ∧ q → p → q

Step-by-step solution

p q p ∧ q p → q p ∧ q → p → q T T T T T T F F F T F T F T T F F F T T p ∧ q → p → q is tautology

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