29: The Prisoners.

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There is a prison with hundred prisoners,each in separate cells with no form of contact. There is an area in the prison with a single light bulb in it. Each day,the warden picks one of the prisoners at random,even if they have been picked before,and takes them out to the lobby. The prisoners have the choice to flip the switch if they want. The light bulb starts off.

When a prisoner is taken into the area with the light bulb,he can also say "Every prisoner has been brought to the light bulb."

If this is true all prisoners would go free. However, if a prisoner chooses to say this and it wrong, all the prisoners would be executed. So a prisoner can only say this if he knows it's the truth for sure.

A day to the beginning of the process,all prisoners were all allowed to get together and they all decided to use a strategy that would ensure that they all get out alive.

What is the strategy?

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