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**wcy****Member**- Registered: 2005-08-04
- Posts: 117

There are three switches and one light bulb, which is kept in a locked room. You are only allowed to go into the room once. How do you tell which switch controls the light bulb? (there is only one such switch)

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**wcy****Member**- Registered: 2005-08-04
- Posts: 117

Answer:

*Last edited by MathsIsFun (2005-08-07 17:59:58)*

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**MathsIsFun****Administrator**- Registered: 2005-01-21
- Posts: 7,663

Just inserted the hide tag for you, wcy, so that people can puzzle over it if they wish.

"The physicists defer only to mathematicians, and the mathematicians defer only to God ..." - Leon M. Lederman

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**wcy****Member**- Registered: 2005-08-04
- Posts: 117

ok thanks

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