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Which all statements are true S1: Negati...

Which all statements are true `S_1:` Negation of `p->q` is `~q->~p,` `S_2:`Negation of `~p<~q` is `pvvq,` `S_3:` Contra positive of `~p>->q` is `p.->~p,` `S_4:` Contra positive of `~pvvq` is `p<~q`

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