A student has to write an exam in which there are two questions. The likelihood of any question on the exam being seen before by the student is 60%. The student finds out somehow that one of the questions on the exam is an unseen question. What is the probability that the other question has been seen by the student before?

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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A student has to write an exam in which there are two questions. The
likelihood of any question on the exam being seen before by the student is
60%.
The student finds out somehow that one of the questions on the exam
is an unseen question. What is the probability that the other question has
been seen by the student before?

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