3 guys on death row -- only one will be not executed tomorrow morning the guard told to John that Pete (among Pete and Paul) will be executed before John got the answer the probability was 1/3, after John got the answer, he is happy: probability 1/2 should he be happy? what’s wrong?

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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3 guys on death row -- only one will be not executed tomorrow morning
the guard told to John that Pete (among Pete and Paul) will be executed
before John got the answer the probability was 1/3,
after John got the answer, he is happy: probability 1/2
should he be happy? what’s wrong?

PS. THE ANSWER IS NOT 1/2

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