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Logical equivalence - class-XII

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Multiple Choice

$\left( {p \Rightarrow q} \right) \to \left[ {\left( {r \vee p} \right) \Rightarrow \left( {r \vee q} \right)} \right]$ is

  1. a contradiction
  2. a tautology
  3. a tautology and a contradiction
  4. neither a tautology nor a contradiction
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