Question 151900
(1)proof that the contrapositive of the statement is logically equivalant to the statement.
(2)Proof also that the converse statement is logically equivalant to the inverse of the statement.

 ans.  using truth table we can prove 
       p  q  ~p  ~q    p=>q  ~q=>~p   q=>p   ~p=>~q

       t  t   f   f     t       t      t       t
       t  f   f   t     f       f      t       t
       f  t   t   f     t       t      f       f
       f  f   t   t     t       t      t       t