Varsity Tutors
Varsity Tutors: Hotmath: Practice Problems: Permutations, Factorials and Combinations
Thirty-one problems present a variety of practice working with permutations, factorials and combinations. They are given with each step to the solution cleverly revealed one at a time. You can work each step of the problem then click the...
Other
The Actuarial Foundation: Let's Go to the Mall! Explorations in Combinatorics
Let's Go to the Mall! is designed to help students understand the connection between various kinds of combinations (multiplication principle and choose numbers) and permutations.
Wolfram Research
Wolfram Math World: Factorial
This page gives a very complete description of the use of factorials in mathematics. The most general information is at the top.
University of Regina (Canada)
University of Regina: Math Central: Thoughts on Teaching Perm. And Combin.
An article written for teachers with recommendations on how to present permutations, combinations, and the binomial theorem to students. It contains both useful suggestions about order of presentation and many class examples. A good...
Texas Instruments
Texas Instruments: Counting Principle, Combinations, and Permutations
Students will solve discrete math problems involving permutations, factorials, and combinations. Students are responsible for deciding which is appropriate to solve a given word problem.
TED Talks
Ted: Ted Ed: How Many Ways Can You Arrange a Deck of Cards?
Any time you pick up a well shuffled deck, you are almost certainly holding an arrangement of cards that has never before existed and might not exist again. Yannay Khaikin explains how factorials allow us to pinpoint the exact (very...
Oswego City School District
Regents Exam Prep Center: Factorials
This math tutorial defines factorial notation and features practice problems and a teacher resource page.
Mathigon
Mathigon: Combinatorics: World of Math
This lesson focuses on Combinatorics, a branch of mathematics which is about counting. It includes 5 sections: Factorials, Permutations, Combinations, Combinatorics and Pascal's Triangle, and Combinatorics and Probability with examples...
CK-12 Foundation
Ck 12: Probability: Basic Counting Rules
[Free Registration/Login may be required to access all resource tools.] This Concept introduces students to the most basic counting rule: the multiplication rule. It also explains the probability of simple random samples.
CK-12 Foundation
Ck 12: Probability: Permutations Grades 10 12
[Free Registration/Login may be required to access all resource tools.] This lesson covers how to define and use factorials to determine the number of permutations or arrangements of objects.
Khan Academy
Khan Academy: Calculating Factorials (Practice)
This is a 7-problem quiz/practice on calculating factorials.
Other
Lake Tahoe Com. College: Fundamental Counting Principle
Explains the fundamental principle of counting, which is the beginning point for any study of counting techniques such as combinations and permutations.
ClassFlow
Class Flow: Divisibility & Factorials
[Free Registration/Login Required] Testing for divisibility of 0, 2, 3, 4, 5, 9, 10 & 11. This flipchart explores factorials and perfect numbers as well.
Interactive Mathematics
Interactive Mathematics: Counting and Probability
An introduction to the concept of counting and probability includes working with factorials and finding the probability of an event.
Shmoop University
Shmoop: Basic Statistics & Probability: Factorials
The probability resource investigates factorials. Students learn about the topic through notes and examples. The tutorial consists of practice exercises to check for comprehension of the concept.
Purple Math
Purplemath: Factorials
A review of factorials in the areas of combinations, permutations, probability, and the Binomial Theorem is presented. Examples are worked out and explained, complete with graphing calculator steps.