Which of the following statement is a contradiction?
(~p∨~q)∨(p∨~q)
(p→q)∨(p∧~q)
(~p∧q)∧(~q)
(~p∧q)∨(~q)
We consider following truth table
Clearly, last column of the above truth table contains only F. Hence, (p∧q)∧~(p∨q) is a contradiction