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Basics of combinatorics. 00:00 Introduction 00:05 Introduction to combinatorics 00:10 Note: there are 24 possible arrangements of the letters E, V, I, L, but only 4 of them give meaningful words 00:50 Product rule 04:19 Example 1 04:52 Example 2 05:51 Sum rule 07:44 Example 3: Disjoint sets 09:14 Example 4: Sets that are not disjoint 11:45 Principle of inclusion and exclusion 12:00 Summary: combinatoric principles More videos from the Combinatorics category: • Combinatorics Elea: Learn Math © 2012 Valdemar Švábenský https://elea.sk / naucsamatiku / naucsamatiku