In a package, there are a total of 40 power banks. 5 of these had been rated with 5 stars, 30 had been rated with 3 stars, the remaining had been rated with 1 star. Eight power banks were to be sold in a certain mall and will randomly selected from the package. What is the probability that of the 8 sold to the mall, there are exactly 2 five-star rated, 4 three-star rated and 2 one-star rated power banks?
In a package, there are a total of 40 power banks. 5 of these had been rated with 5 stars, 30 had been rated with 3 stars, the remaining had been rated with 1 star. Eight power banks were to be sold in a certain mall and will randomly selected from the package. What is the probability that of the 8 sold to the mall, there are exactly 2 five-star rated, 4 three-star rated and 2 one-star rated power banks?
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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