1) which of the following is the value of tautology? a) [(p-->q) v~p]---->q b) ~(p/\q) <->p/\~q c) (p/\q)<->(p v q) 2) which of the following is the value of constigency? a) ~[(p--->q) v~p]--->q b) p v q<-> q v p c) [(p--->q) /\ (q--->q /\(q--->r)]--->(p--->r) 3) which of the following is the value of contradiction? a) ~p/\~q b) (p--->q) v~p c) ~((p/\q)<-->(p/\q))

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