# Permutations and Combinations Compared

## Order is important when picking r at a time from a group of n:  nPr = n!/ (n-r)!

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## Permutations and Combinations Compared

by CK-12 //basic
Covers the formula for permutations.
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## Combinations - Overview

by CK-12 //basic
Overview
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## Permutations Principles

by CK-12 //basic
This video gives more detail about the mathematical principles presented in Permutations.
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## Permutations Examples

by CK-12 //basic
This video shows how to work step-by-step through one or more of the examples in Permutations.
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## Permutations: An Introduction

by CK-12 //basic
An introduction to permutations.
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## Combinations - Example 4

by CK-12 //basic
Counting the Number of Combinations
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## Combinations - Example 5

by CK-12 //basic
Finding Probability Using Combinations
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• Lesson Plan

## Permutations Lesson Plan

by CK-12 //basic
This lesson plan covers Permutations and includes Teaching Tips, Common Errors, Differentiated Instruction, Enrichment, and Problem Solving.
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