Which of the following is a contradiction?

1.	Which of the following is a contradiction?
A.	\[(p\wedge q)\wedge \tilde{\ }(p\vee q)\]
B.	\[p\vee (-p\wedge q)\]
C.	\[(p\Rightarrow q)\Rightarrow p\]
D.	None of these
Answer» B. \[p\vee (-p\wedge q)\]

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Which of the following is a contradiction?

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