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MHT CET202012 Oct 2020Morning ShiftMathematicsMathematical ReasoningActual

Which of the following statement pattern is a tautology? S ₁ p ( q p ) S ₂ p V q S ₃ ( p q ) ( q p ) S ₄ ( q p ) ( p q )

Options

  1. AS ₂
  2. B~S ₄
  3. C~S ₁
  4. D~S ₃

Correct answer

B. ~S ₄

Step-by-step solution

We find that all entries in column (12) are T S ₄ is a tautology

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