Wednesday, September 16, 2009

How about a Riddle?

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?


Anonymous said...

You turn the first switch on and leave it on.
Wait 1 hour.

Turn on the second switch.

Go to the other room.

Two bulbs will be one, one very hot and one not so hot. The very hot is the first switch, the not so hot is second.

The one that's still off is the third.

Powdered Toast Man said...

correct answer, who answered it?