Combinatorics and probability.

This book is devoted to elementary combinatorics, probability theory and their applications. It systematically uses a theoretical and many language. The abstractness of this language is compensated by a large number of detailed examples. The tasks are collected in certain parts that can be read independently. There are simple models associated with modern applications of combinatorics and probability theory. The book is intended for engineers and scientists of all specialties interested in probability theory. It will be useful to students and teachers.