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Which one of the follow ing options is a tautology?
$$(\sim Q \rightarrow \sim P) \vee Q$$
$$(P \wedge Q) \rightleftharpoons (\sim P \vee \sim Q)$$
$$\sim (P \vee Q) \vee (\sim P \wedge Q) \vee P$$
$$(P \vee Q) \wedge (\sim P \vee \sim R)$$
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