UGC NET CSE | December 2007 | Part 2 | Question: 6

Question

A $WFF$ that is equivalent to the $WFF$ $x=> y$ is :

• A. $y=>x$

• B. ~$y=>x$

• C. ~$y=>$ ~$x$

• D. $y=>$ ~$x$

Answer 1

C is contrapositive of original formula. So C is correct.