Which is the Probability that the ATMs that he managed to visit two were damaged?

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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2. An office building has 20 ATMs. Of the 20 ATMs, 5 are in poor condition. A technician has the possibility of examining 3 random chosen. Which is the Probability that the ATMs that he managed to visit two were damaged?
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