There are three switches downstairs. Each corresponds to one of the
three light bulbs in the attic. You can turn the switches on and off and
leave them in any position.
How would you identify which switch corresponds to which light bulb, if you are only allowed one trip upstairs
Keep the first bulb switched on for a few minutes. It gets warm, right?
So all you have to do then is ... switch it off, switch another one on,
walk into the room with bulbs, touch them and tell which one was
switched on as the first one (the warm one) and the others can be easily
identified :-)
No comments:
Post a Comment