Another one !
You are in a room in which there are two doors A and B.
One of the two doors is the door of Paradise, the other one is the door of Hell.
There is a guard in front of each door.
One of the two guards always says the truth, on the other hand, the other guard lies continuously.
The two guards know each other very well and both of them know which is the Paradise door and which is the Hell door.
You have the right to ask one and only one question to one of the two guards in order to determine with exactitude which is the door of Paradise, door A or door B.
Which is this question ?
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