There is a prison with a hundred (100) prisoners, each in seprate cells with no form of contact. There is an area in the prison with a single (1) light bulb in it. Each day the warren picks one (1) of the prisoners at random even if they have been picked before, and takes them out to the lobby. The prisoner will 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. If this is true all prisoners will go free. However if s prisoner chooses to say this and it's wrong, all the prisoners will be executed. So a prisoner should only say this if he knows it's true for sure. Before the first day of this process begins, all prisoners are allowed to get together to discuss a strategy to eventually save themselves. What strategy could they use to ensure their safety?