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Combinatorics
General Introduction to Combinatorics

Ed Bender	Counting and Listing
Ed Bender	Basic Counting

Combinations

Dr. Howard Ufigure	Possible Combinations
Illinois State University	Combinations

Factorials

All About Circuits	Factorials
Fact Monster	Factorials
Illinois State University	Factorial Notation
Math League	Factorial Notation

Tree Diagrams

Dr. Howard Ufigure	Tree Diagrams
Ed Bender	Decision Trees

Permutations

Cut the Knot	Permutations
Cut the Knot	Various Ways to Define a Permutation
Cut the Knot	Counting and Listing All Permutations
Illinois State University	Circular Permutations
Illinois State University	Permutations

Pascal's Triangle

Illinois State University	Pascal's Formula
Illinois State University	Pascal's Triangle
KryssTal	Pascal's Triangle

Derangements

Delphi for Fun	Derangements
Illinois State University	Derangements

Other Specific Topics

Illinois State University	Pigeonhole Principle
Illinois State University	The Addition Principle
Illinois State University	Arranging Elements When Repetition Is Allowed
Illinois State University	The Multiplication Principle
Illinois State University	Finite Differences
Illinois State University	Generating Functions
Illinois State University	Inclusion-Exclusion Principle
Illinois State University	Number of Subsets of a Set
Jim Albert	Listing All Possible Outcomes (the Sample Space)
Jim Albert	Equally Likely Outcomes

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Page last updated: February 12, 2005