Ù ( ) logically equivalent to p Ú . Determine the truth value of each of the following statements: (a) and + = (b) and + = (c) + = and (d) and (a) (b) (c) (d) ( ) ( ) ( ) ( ) . Which one of the following is not true? ( ) Negation of a negation of a statement is the statement itself.
( ) If the last column of the truth table contains only T then it is a tautology. ( ) If the last column of its truth table contains only F then it is a contradiction ( ) If p and q are any two statements then p « is a tautology. - -