JEE Main · MathematicsHard
Which of the following propositions is a tautology?
- A.
- B.
- C.
- D.All of the above
Show correct answer & step-by-step solution
Correct answer: D — All of the above
Solution
All three expressions are fundamental logical tautologies. Option A is a basic inclusion, Option B is the law of contraposition, and Option C is the Modus Ponens rule.
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