The 100 Prisoners Riddle: A Classic Brain Teaser
The “100 prisoners riddle” is a classic brain teaser that challenges individuals to come up with a plan to escape from prison. In this puzzle, 100 prisoners are locked in cells and cannot communicate with each other. There is a central living room with a light bulb that is initially off and can be toggled on and off by a prisoner who is selected to visit the room each day.
The Goal: Assert That All 100 Prisoners Have Visited the Living Room
If any prisoner can correctly assert that all 100 prisoners have visited the living room, they will be set free. However, if the assertion is false, all of the prisoners will be shot. Therefore, the prisoners must devise a strategy to ensure that someone can make a correct assertion with 100% certainty.
A Possible Solution to the 100 Prisoners Riddle
One possible solution is for the prisoners to appoint a captain or manager who will be in charge of keeping track of the visits to the living room. When a prisoner, other than the manager, enters the room and the light is off, they should turn it on. If the light is already on, the prisoner should leave it untouched. When the manager enters the room and the light is off, they should leave it untouched. If the light is on, the manager should turn it off and add one to their count.
The Final Step: Asserting That All 100 Prisoners Have Visited the Living Room
When the manager’s count reaches 99, they can confidently assert that all 100 prisoners have visited the living room and the prisoners will be set free. By following this plan, the prisoners can solve the “100 prisoners riddle” and escape from prison.
The “100 prisoners riddle” may seem impossible at first, but with careful planning and strategy, the prisoners can use the clues given to them to solve the puzzle and win their freedom.
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