Intro to Factorials i.e. 4! = 4·3·2·1 = 24

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In this video I introduce the concept of factorials and do various examples on multiplying and dividing them out. I also show a quick proof showing that 4 distinct objects can be sorted in 4! = 4·3·2·1 = 24 ways. It's pretty useful especially if you are into poker, statistics etc., so make sure you understand factorials!


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Factorials - Introduction

i.e. 5! = 5·4·3·2·1 = 120

Factorials 1080p.jpeg

Factorials

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Example 1: 3!

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Example 2: 4!

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Example 3: 6!/4!

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Sorting n Objects

The number of ways of sorting n objects or distinct numbers in a sequence is equal to n!.

Example 4: Sorting 4 Letters

How many ways are there of sorting the following letters in a sequence:

A, B, C, D

Solution:

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