In this lecture, the instructor continues discussing counting problems and focuses on the inclusion-exclusion principle, which is a complement principle used to solve problems that are difficult to solve otherwise. Additionally, the instructor introduces the pigeonhole principle, which is a separate principle and explains it through examples. The lesson concludes with the application of constraints to counting problems and different methods to solve such problems.
More Counting problems are explained.
More information about this course:
http://www.aduni.org/courses/discrete
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