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There are two doors, each with one guard. One guard always lies and the other always answers truthfully. One door leads to the castle and the other leads to 'certain death'. The puzzle is to find out which door leads to the castle by asking one of the guards one question.
An intercom and/or video camera are often used to allow the guard to control the trap from a remote location. In an automatic mantrap, identification may be required for each door, sometimes even different measures for each door. For example, a key may open the first door, but a personal identification number entered on a number pad opens the ...
In addition, during a fire or a similar emergency situation in which it is necessary to escape, lockable windows, window shutters or grilles (especially fixed ones) may become dangerous obstacles, so it is necessary to ensure that the keys are as close to the windows as is practical or, if a window is an important emergency exit, that it can be ...
The elevated booth is equipped with a 12-gauge shotgun loaded with 7 1/2-birdshot—the same tiny pellets that sport shooters use to blow apart clay pigeons and that hunters use to kill birds and rabbits. The windows of the bubble, which are reinforced with security bars, can be opened to aim a gun through.
If the car is behind door 1, the host can open either door 2 or door 3, so the probability that the car is behind door 1 and the host opens door 3 is 1 / 3 × 1 / 2 = 1 / 6 . If the car is behind door 2 – with the player having picked door 1 – the host must open door 3, such the probability that the car is behind door ...
Door guards (hinge guards, anti-finger trapping devices, or finger guards) help prevent finger trapping accidents, as doors pose a risk to children, especially when closing. Door guards protect fingers in door hinges by covering the hinge-side gap of an open door, typically with a piece of rubber or plastic that wraps from the door frame to the ...
Here, the winning probability is 2 / 3 , which is optimal since the first player cannot have a higher winning probability than that. [13] In a further variant, three prizes are hidden behind the three doors and three players have to independently find their assigned prizes with two tries.
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related to: two doors with three guards on windowsmarvin.com has been visited by 10K+ users in the past month