Question

If Dave finishes mowing the lawn, then he will watch a movie.

Which of these is logically equivalent to the given statement?
Answer
If Dave did not finish mowing the lawn, then he watched a movie.
If Dave finished mowing the lawn, then he did not watch a movie.
If Dave watched a movie, then he did not finish mowing the lawn.
If Dave did not watch a movie, then he did not finish mowing the lawn.

Answer 1

If Dave did not watch a movie, then he did not finish mowing the lawn.

Answer 2

If Dave did not watch a movie, then he did not finish mowing the lawn. Exactly.

Answer 3

good answer parth