A) \[\tilde{\ }r\Rightarrow \ \tilde{\ }p\vee q\]
B) \[\tilde{\ }p\vee q\Rightarrow \ \tilde{\ }r\]
C) \[r\Rightarrow p\ \wedge \tilde{\ }q\]
D) None of these
Correct Answer: B
Solution :
Inverse of \[p\Rightarrow q\] is \[\tilde{\ }p\Rightarrow \ \tilde{\ }q\] \ inverse of \[(p\ \wedge \tilde{\ }q)\Rightarrow r\] is \[\tilde{\ }(p\ \wedge \tilde{\ }q)\Rightarrow \ \tilde{\ }r\] i.e. \[(\tilde{\ }p\vee q)\Rightarrow \ \tilde{\ }r\].
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