This problem is known as the Three prisoners problem. Three prisoners, A, B and C, are in separate cells and sentenced to death. The governor has selected one of them at random to be pardoned. The warden knows which one is pardoned, but is not allowed to tell. Prisoner A begs the warden to let him know the identity of one of the others who is going to be executed. If B is to be pardoned, give me C's name. If C is to be pardoned, give me B's name. And if I'm to be pardoned, ip a coin to decide whether to name B or C. The warden tells A that B is to be executed. Then, Prisoner A secretly tells C the news. Prisoner A says that he is pleased because his probability of surviving has gone up from 1/3 to 1/2, as it is now between him and C. Prisoner C says that he is pleased because A still has a chance of 1/3 to be the pardoned one, but his chance has gone up to 2/3.
This problem is known as the Three prisoners problem. Three prisoners, A, B and C, are in separate cells and sentenced to death. The governor has selected one of them at random to be pardoned. The warden knows which one is pardoned, but is not allowed to tell. Prisoner A begs the warden to let him know the identity of one of the others who is going to be executed. If B is to be pardoned, give me C's name. If C is to be pardoned, give me B's name. And if I'm to be pardoned, ip a coin to decide whether to name B or C. The warden tells A that B is to be executed. Then, Prisoner A secretly tells C the news. Prisoner A says that he is pleased because his probability of surviving has gone up from 1/3 to 1/2, as it is now between him and C. Prisoner C says that he is pleased because A still has a chance of 1/3 to be the pardoned one, but his chance has gone up to 2/3.
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Q.3.
This problem is known as the Three prisoners problem. Three prisoners, A, B and C, are in separate cells and sentenced to
death. The governor has selected one of them at random to be pardoned. The warden knows which one is pardoned, but is
not allowed to tell. Prisoner A begs the warden to let him know the identity of one of the others who is going to be executed.
If B is to be pardoned, give me C's name. If C is to be pardoned, give me B's name. And if I'm to be pardoned, ip a coin
to decide whether to name B or C. The warden tells A that B is to be executed. Then, Prisoner A secretly tells C the news.
Prisoner A says that he is pleased because his probability of surviving has gone up from 1/3 to 1/2, as it is now between him
and C. Prisoner C says that he is pleased because A still has a chance of 1/3 to be the pardoned one, but his chance has gone
up to 2/3. Is the statement of Prisoner A correct? Is the statement of Prisoner C correct?
2
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