12. A supplier delivers an order for 20 electric toothbrushes to a store. By accident, three of the electric toothbrushes are defective. What is the probability that the first electric toothbrush sold defootuo?

12. A supplier delivers an order for 20 electric toothbrushes to a store. By accident, three of the electric toothbrushes are defective. What is the probability that the first electric toothbrush sold defootuo?

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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12. A supplier delivers an order for 20 electric toothbrushes to a store. By accident, three of the
electric toothbrushes are defective. What is the probability that the first electric toothbrush sold
will be returned because they are defective?

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