Let p, and q be 2 statements. Consider the conditional p⇒q (that is, if p then q).
i)  The converse of the statement is q⇒p.
ii). The inverse of the statement is ¬p⇒¬q.
iii). The contrapositive of the statement is ¬q⇒¬p.
Let p:Â it is October 31, and let q:Â it is Halloween.Â
The converse of the conditional p⇒q  is q⇒p:
          If it is Halloween, then it is October 31.Â
The inverse is ¬p⇒¬q:
          If it is not October 31, then it is not Halloween.
The contrapositive ¬q⇒¬p is:
           If it is not Halloween, then it is not October 31.