A) \[r\Rightarrow (p\vee q)\]
B) \[\tilde{\ }r\Rightarrow (p\vee q)\]
C) \[\tilde{\ }r\Rightarrow \ \tilde{\ }p\ \wedge \tilde{\ }q\]
D) \[p\Rightarrow (q\vee r)\]
Correct Answer: C
Solution :
Contrapositive of \[p\Rightarrow q\] is \[\tilde{\ }q\Rightarrow \ \tilde{\ }p\] \ contrapositive of \[(p\vee q)\Rightarrow r\] is \[\tilde{\ }r\Rightarrow \ \tilde{\ }(p\vee q)\] i.e. \[\tilde{\ }r\Rightarrow (\tilde{\ }p\ \wedge \tilde{\ }q)\].
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