need your help with the question attached. Please show the work done because I need to understand them. Thank you!

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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Q13) I need your help with the question attached. Please show the work done because I need to understand them. Thank you!

Twenty light bulbs are tested to see if they last as long as the manufacturer claims
they do. Three light bulbs fail the test. Two light bulbs are selected at random without
13.
replacement.
a) What is the probability both light bulbs failed the test?
b) What is the probability at least one light bulb passed the test?
Transcribed Image Text:Twenty light bulbs are tested to see if they last as long as the manufacturer claims they do. Three light bulbs fail the test. Two light bulbs are selected at random without 13. replacement. a) What is the probability both light bulbs failed the test? b) What is the probability at least one light bulb passed the test?
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