# 7. Calculating Permutations

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Overview

Permutations tell us how many ways we can arrange a set of objects, and are used in many probability problems. Learn how to calculate the number of permutations a problem has in this lesson.

Summary

1. Lesson Goal (00:14)

The goal of this lesson is to learn what permutations are and learn how to calculate them.

2. Overview of Permutations (00:44)

A permutation is an ordered arrangement of some or all of the items in a set. For example, if we have a series of 5 colored squares, any ordered arrangement of these squares represents a different permutation.

We may want to find the number of possible permutations for a set of items. To do this, we can consider the process of creating a new permutation. As an example, if we have 5 items, there are 5 possible items we can put in the first slot, 4 possible items for the second slot, and so on. As a result, the number of permutations is 5 x 4 x 3 x 2 x 1, which is 120.

Transcript

Applications of Probability
Probability Principles

Contents

09:00

04:55

06:12

05:35

07:25

06:50

06:03

04:20

#### 9. Understanding Sampling

06:39

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