Twenty batteries will be put on the display. The types of batteries are: AAA, AA, C, D, and 9-volt. a. How many ways can we choose the twenty batteries? b. How many ways can we choose the twenty batteries but be sure that at least four batteries that are are 9-volt batteries? c. How many ways can we choose the twenty batteries but have no more than two batteries that are 9-volt batteries?

Twenty batteries will be put on the display. The types of batteries are: AAA, AA, C, D, and 9-volt. a. How many ways can we choose the twenty batteries? b. How many ways can we choose the twenty batteries but be sure that at least four batteries that are are 9-volt batteries? c. How many ways can we choose the twenty batteries but have no more than two batteries that are 9-volt batteries?

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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Concept explainers

Counting Principles

In statistics, the counting principle can be said to be the concept in which the quantity of an item is determined. There can be a single item, or a group of items, or items that are related to each other. In every possible set of items, the quantity of the possible item groups or their sorting measures can be determined with counting principles.

Question

Twenty batteries will be put on the display. The types of batteries are: AAA, AA, C, D, and 9-volt.
a. How many ways can we choose the twenty batteries?
b. How many ways can we choose the twenty batteries but be sure that at least four
batteries that are are 9-volt batteries?
c. How many ways can we choose the twenty batteries but have no more than two batteries that are 9-volt batteries?

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