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Probability

What is the probability that at least one of the four packs she bought will have past its sell-by date a week from now?

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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Question

On a supermarket shelf, there are 45 packs of cereals. Among these, there are five packs whose sell-by date is less than a week from now. Lena selects four packs of cereals at random and intends to consume them after a week, since she has another pack of cereals at home. What is the probability that at least one of the four packs she bought will have past its sell-by date a week from now?

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