Monday, May 4, 2009
There are three switches in front of you. Each corresponds to one of the three light bulbs in the next room. You can turn the switches on or off and leave them in any position.
How would you identify which switch corresponds to which light bulb, if you are only allowed to enter the next room once?
Solution (Highlight):
First, turn the first light switch on for an extended period of time. Then, turn it off.
Turn the second switch on and leave the third switch off.
Move into the next room. The bulb that is on will be the second switch and the bulb that is hot and off will be connected to the first switch.
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