A) \[\tilde{\ }p\wedge (q\wedge r)\]
B) \[p\vee (q\vee r)\]
C) \[p\vee (q\wedge r)\]
D) \[\tilde{\ }p\vee (q\wedge r)\]
Correct Answer: D
Solution :
\[\tilde{\ }(p\wedge (q\to \tilde{\ }r))=\tilde{\ }p\vee \tilde{\ }(q\to \tilde{\ }r)\] \[=\tilde{\ }p\vee (q\wedge \tilde{\ }(\tilde{\ }r))\] \[=\,\,\tilde{\ }p\vee (q\wedge r)\]
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