Women Or Tigers? — Solution to First Challenge

Let us assume that the sign on the door to Room I tells the truth. This would mean that there is a woman in that room, and a tiger in Room II.

It would also mean that the sign on the door to Room II tells a lie. This cannot be the case, as it says that there is a woman in one room and a tiger in the other.

Therefore, the sign on Room II must be true: There is indeed a woman behind one door, and a tiger behind the other.

As there is a true and a false sign, the sign on Room I must be the false one. In other words, Room I contains the tiger, and Room II the woman. The prisoner, unless he is tired of life, should choose door #2.

Easy no? Tomorrow’s challenge will be slightly less straight-forward. So stay tuned.