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NTA Abhyas JEE Main2020MathematicsMathematical ReasoningPractice

Which of the following option is incorrect?

Options

  1. A~ p ⇔ ~ q ≡ p ⇔ q
  2. Bp ⇔ ~ q ≡ p → ~ q ∧ ~ q → p
  3. C~ p ⇔ q ≡ ~ p ⇒ q
  4. D~ p ⇒ q ≡ p ∧ ∼ q

Correct answer

C. ~ p ⇔ q ≡ ~ p ⇒ q

Step-by-step solution

Option (D) is a theorem, hence (D) is correct For option (B), s ↔ t ≡ s → t ∧ t → s , hence (B) is correct For option (A), ~ p ⇔ ~ q ≡ p ⇔ ~ ~ q ≡ p ⟺ q Hence, (A) is correct For option (C), ~ p ⇔ q ≡ ~ p ⇔ q Hence, option (C) is incorrect

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