Question

“If Bob is swimming, then Henry is skating.”

Which of these is logically equivalent to the above statement?
Answer
If Bob is swimming, then Henry is not skating.
If Bob is not swimming, then Henry is skating.
If Henry is skating, then Bob is not swimming.
If Henry is not skating, then Bob is not swimming.

Answer 1

so this one would be #4??

Answer 2

Yes, the contrapositive, yes.

Answer 3

which is log. =

Answer 4

?