There are three light switches up in the attic of an old house... They control three light bulbs down in the basement. The problem is that you don't know which switch is connected to which bulb. You can make one trip down to the basement to figure this out.
How are you going to do it?
*scroll down for answer*
Turn on TWO of the switches and wait about 15 minutes...
Turn off ONE switch and go down to the basement...
The bulb that is lit matches up to the switch you left on...
The bulb that is off and WARM matches up to the switch that was on, but was turned off...
The bulb that is off and cold matches up to the switch you never touched.
How are you going to do it?
*scroll down for answer*
Turn on TWO of the switches and wait about 15 minutes...
Turn off ONE switch and go down to the basement...
The bulb that is lit matches up to the switch you left on...
The bulb that is off and WARM matches up to the switch that was on, but was turned off...
The bulb that is off and cold matches up to the switch you never touched.