Question
Tom, Ann and John find themselves trapped in a dark and cold dungeon. After a quick search the boys find three doors, the first one red, the second one blue , and the third one green.
Behind one of the doors is a path to freedom. Behind the other two doors, however, is a fatal trap. Opening a door to the fatal trap means almost certain death.
On each door there is an inscription
(red) : "freedom is not behind this door"
(blue) : "freedom is behind this door"
(green) : "freedom is not behind the red door"
Given the fact that at LEAST ONE of the three statements on the three doors is True and at LEAST ONE of them is False, which door would lead the boys to safety? Justify your answer.