Geometry 13.1b, Introducing Permutations & Factorials

An explanation of permutations as a selection of a group of objects in which order is important. We find the number of permutations by using the expression n(n-1)(n-2)(n-3)…(1), which is called “n factorial” and is written as “n!” We find the permutations for three items as 3(2)(1)=6. We discuss why 0! =1, and also how to find the possible permutations of a group when we don’t want to put an entire set of items in order.

Geometry 13.1a, Fundamental Counting Principle

Algebra 2 Chapter 15, Counting and Probability

High School Geometry Playlist
https://www.youtube.com/playlist?list=PLKi4WTp6PRGVBM1nPhwW1lTuxi32Q0IZ3

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