A) \[\tilde{\ }p\vee q\Rightarrow \tilde{\ }r\]
B) \[\tilde{\ }r\Rightarrow \tilde{\ }p\vee q\]
C) \[r\Rightarrow p\wedge \tilde{\ }q\]
D) None of these
Correct Answer: A
Solution :
The negation of\[(p\wedge \tilde{\ }q)\Rightarrow r\]is \[\tilde{\ }[(p\wedge \tilde{\ }q)\Rightarrow r]\] \[\equiv (\tilde{\ }p\vee q)\Rightarrow \tilde{\ }r\]
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