How did the clever prisoner find the answer ?!
Question: How did the clever prisoner find the answer !?
The prisoners are tied to a chair each, lined up in a row in such way that the last one looks at the backs of the two men in front, the one in the middle looks at the back of the man directly in front of him, and the first one looks at the wall!. The warden approaches and instructs them “There are five discs, three black and two white ones!. Each of you has one of them attached to his back and the first one to tell me the color of the disc on his back will be released!. By admitting that you don’t know the answer, your detention will continue as determined!. Yet, by giving the wrong answer, your detention will be doubled!.”
The prisoner at the rear end sees a black disc attached to each of the men’s backs in front of him!. Consequently, he concludes that there are one black and two white discs left over!. The warden asks him: “What is the disc’s color on your back!?”
The man considers!. He would need to take a guess, as the disc could be either black or white!.
Deciding that the risk of having his detention doubled is too high, he answers: “I don’t know the color!.”
He thinks by himself: “If only he had two white discs attached to their back, it would have been an easy task!.” This is what the two other prisoners think as well!.
Now the warden approaches the prisoner in the middle and asks again: “What is the disc’s color on your back!?”
The man reflects: If the disc on his back and that of the man in front of him were white, the man behind him would have known his own disc’s color!. But because the first man’s disc is black, the man in the rear is unable to tell his own disc’s color, both, if he – the man in the middle – has either a black or a white disc attached to his back!. He stops thinking at this stage because it seems to risky to guess the color!. So he says: “I don’t know the color!.” And he thinks by himself: “If only the man in front of me had a white disc attached to his back, I would have known for sure that my disc is not white!. Had it been white, the man in the rear would have known the answer!. Given the fact that the disc of the man in the front disc is black, mine could be either!.”
Now the warden approaches the prisoner in the front, amicably puts his hand on his shoulder and asks for a last time: “What is the disc’s color on your back!?”
He immediately receives the correct answer: “Black!”
How come he find the correct answer!?Www@Enter-QA@Com
The prisoner at the rear end sees a black disc attached to each of the men’s backs in front of him!. Consequently, he concludes that there are one black and two white discs left over!. The warden asks him: “What is the disc’s color on your back!?”
The man considers!. He would need to take a guess, as the disc could be either black or white!.
Deciding that the risk of having his detention doubled is too high, he answers: “I don’t know the color!.”
He thinks by himself: “If only he had two white discs attached to their back, it would have been an easy task!.” This is what the two other prisoners think as well!.
Now the warden approaches the prisoner in the middle and asks again: “What is the disc’s color on your back!?”
The man reflects: If the disc on his back and that of the man in front of him were white, the man behind him would have known his own disc’s color!. But because the first man’s disc is black, the man in the rear is unable to tell his own disc’s color, both, if he – the man in the middle – has either a black or a white disc attached to his back!. He stops thinking at this stage because it seems to risky to guess the color!. So he says: “I don’t know the color!.” And he thinks by himself: “If only the man in front of me had a white disc attached to his back, I would have known for sure that my disc is not white!. Had it been white, the man in the rear would have known the answer!. Given the fact that the disc of the man in the front disc is black, mine could be either!.”
Now the warden approaches the prisoner in the front, amicably puts his hand on his shoulder and asks for a last time: “What is the disc’s color on your back!?”
He immediately receives the correct answer: “Black!”
How come he find the correct answer!?Www@Enter-QA@Com
Answers:
It had to be black otherwise one of the prisoners behind him would have been able to deduce the color of their disks!.
OK I'll try to explain it better!.!.
If the prisoners on the first and second row both had a white disk, the one at the back would immediately know his disk was black!.!.
If just the one at the front had a white disk and the middle prisoner had a black one then prisoner at the back would have to say he didn't know!. As soon he said this the middle prisoner would know that he must have a black one!.
So the only way that neither the middle or back person would know the color of their disk is if the front persons disk was black!.Www@Enter-QA@Com
OK I'll try to explain it better!.!.
If the prisoners on the first and second row both had a white disk, the one at the back would immediately know his disk was black!.!.
If just the one at the front had a white disk and the middle prisoner had a black one then prisoner at the back would have to say he didn't know!. As soon he said this the middle prisoner would know that he must have a black one!.
So the only way that neither the middle or back person would know the color of their disk is if the front persons disk was black!.Www@Enter-QA@Com
maybe the warden is wearing a watch and when he put it in the prisoner's shoulder, the color of the disc in his back was reflected by the glass on the watch of the warden!.Www@Enter-QA@Com
He must have bribed one of the wardens to tell him what color disc he was going to have put on his back, possibly with cigarettes or maybe with sexual favours after lights out!.Www@Enter-QA@Com
The disk came off of his back and was on the floor and he saw it!.!.!.Www@Enter-QA@Com
idk how!?Www@Enter-QA@Com
i don't get it :[Www@Enter-QA@Com