Example 9.4 Find the chance of getting 3 successes in 5 trials when the chance of getting a success inone trial is 2/3.

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Answered: Example 9.4 Find the chance of getting…

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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I understand all of this except: Why did the probability start at 125+5 instead of 120+5?

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Example 9.4 Find the chance of getting 3 successes in 5 trials when the chance of getting a success in one trial is 2/3.