A prize is in either a red box or a blue box. The red sign says “The prize is here.” The blue sign says “The prize is in the red box.” If both signs are false, where is the prize?
A little nudge?
Both signs make the same claim.
Ready for the answer?
In the blue box.
Both statements say the prize is in the red box. If both are false, it is not in red. With only two possible boxes, it must be in blue.