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Topic: Find the switch (Read 912 times) |
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contact.symmetrize
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Find the switch
« on: Feb 18th, 2013, 7:14am » |
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There are a few rooms in a room. Close to the entrance there are 3 light switches names A, B & C. At the farthest corner there is a closed room with a single light bulb and the door of the room is closed. How to find which switch is connected to the light bulb? You are allowed to go to the farthest room only once, open the door and check the whether the light is on. Try to solve this..
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Grimbal
wu::riddles Moderator
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Re: Find the switch
« Reply #1 on: Feb 19th, 2013, 6:10am » |
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Turn switch B on, A and C off.
Wait 10 minutes.
Turn swith B off and A on.
Go see the lamp.
If the bulb is on the correct switch is A.
Else, if the bulb is hot the correct switch is B.
Else, the correct switch is C.
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