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
- a contradiction
- a tautology
- a tautology and a contradiction
- neither a tautology nor a contradiction