Write the contropositive

Question

If an object is round, then it is a ball.

Answer 1

The contrapositive of "if P, then Q" is "if not Q, then not P".  

 

So, the contrapositive of the statement "if an object is round, then it is a ball" is "if it is not a ball, then the object is not round".  

Answer 2

For the conditional

 

if a, then b

 

The contrapositive is

 

if not b, then not a

 

If an object is not a ball, then it is not round.