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\[\tilde{\ }q\Rightarrow \tilde{\ }p\] \[\therefore \]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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