In my safe is a sheet of paper with two shapes drawn on it in colored crayon. One is a square, and the other is a triangle. Each shape is drawn in a single color. Suppose you believe me when I tell you that
if the square is blue, then the triangle is green. What do you therefore know about the truth value of the following statements?
- The square and the triangle are both blue.
- The square and the triangle are both green.
- If the triangle is not green, then the square is not blue.
- If the triangle is green, then the square is blue.
- The square is not blue or the triangle is green.