Facts101 is your complete guide to Introductory Combinatorics. In this book, you will learn topics such as The Pigeonhole Principle, Generating Permutations and Combinations, The Binomial Coefficients, and The Inclusion Exclusion Principle and Applications plus much more. With key features such as key terms, people and places, Facts101 gives you all the information you need to prepare for your next exam. Our practice tests are specific to the textbook and we have designed tools to make the most of your limited study time.