Turn Off the Lights

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The purpose of this little game is to turn off all the lights. But the situation is a little bit more complicated than usual: if you press a button, the corresponding light and its two neighbors change their state. How many attempts do you need to turn off all lights?

Contributed by: Edda Eich-Soellner (University of Applied Sciences, Munich, Germany) (March 2011)
Open content licensed under CC BY-NC-SA



Hint: it is possible to turn off all the lights with at most seven clicks.

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