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0 votes
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in Discrete Mathematics by (46.9k points)

Which one of the following is not true? 

(a) Negation of a negation of a statement is the statement itself. 

(b) If the last column of the truth table contains only T then it is a tautology. 

(c) If the last column of its truth table contains only F then it is a contradiction

(d) If p and q are any two statements then p ⟷ q is a tautology.

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1 Answer

+1 vote
by (49.1k points)

(d) If p and q are any two statements then p ⟷ q is a tautology.

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