mesoteto on 16 September 2008
| Lem_Nx said: Imagine you are in a room with 3 switches. In an adjacent room there are 3 bulbs (let's say in lamps which are on a regular table), each switch belongs to one bulb. All are off at the moment. It is impossible to see from one room to another. No help from anybody else is allowed. How can you find out which switch belongs to which bulb, if you may enter the room with the bulbs only once? |
its easy
flip one switch on and wait a few mintues (lets bulb heat up) then turn it off
move quickly and flip another switch
walk briskly over to teh room and you will now have one lamp on (the switch you flipped just now)
one lamp off with a cool bulb (the switch you never flicked)
and one lamp off but with a warm bulb (the one you flipped first)
