Question

Which statement is logically equivalent to the following conditional statement?

If it has five sides, then it is not an octagon.

Answers.
If it does not have five sides, then it is an octagon.
If it is not an octagon, then it has five sides.
If it is an octagon, then it does not have five sides.
If it does not have five sides, then it is not an octagon.

Answer 1

i think its the third one.
if it is an octagon then it does not have five sides

Answer 2

i think so
p --> q equivalent to ~q --> ~p

Answer 3

thanks

Answer 4

welcome :)