There is a corridor that leads into an empty room. The room is completely empty except for a lamp in one of the corners. On the other side of the corridor are three switches.I'm getting tired of spam comments, I have disabled the captcha thing which is supposed to prevent spam comments for the sake of commenters who have a hard time reading those minuscule and often unreadable words. Hope blogger comes up with something like wordpress to prevent spam comments.
You know that one of them turns on the lamp, the other two don't do anything. You can play around with the switches turning each of them on and off as much as you like, then you can go into the room one time to check whether the lamp is on or off (there is a door so you can't know without entering the room).
Leaving the room, you have to know which of the 3 switches works and which 2 don't.
The question is: How do you do it?
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