Two defective tubes get mixed up with 2 good ones. The tubes are tested, one byone, until both defectives are found. What is the probability that the last defec-tive tube is obtained on (i) the second test, (ii) the third test and (iii) the fourthtest?

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Answered: Two defective tubes get mixed up with 2…

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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Two defective tubes get mixed up with 2 good ones. The tubes are tested, one by one, until both defectives are found. What is the probability that the last defec- tive tube is obtained on (i) the second test, (ii) the third test and (iii) the fourth test?