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What is the probability of selecting a non-defective phone followed by another non-defective phone? b) that the 2 telephones are defective

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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There are 25 cell phones in a box of which four are defective. 2 phones are selected, one after the other without reset.
a) What is the probability of selecting a non-defective phone followed by another non-defective phone?
b) that the 2 telephones are defective.

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