Keyword: «conditional probability of the event»

The paper proposes a technique for presenting the topic "The formula of full probability and the Bayes formula" based on the personal experience of the authors in the discipline "Theory of Probability". When solving problems on this topic, the greatest difficulty for students is calculation of conditional probabilities. In this connection, special attention is paid to the method of solving problems. The main theoretical information and a large number of typical examples showing solutions that allow students to acquire the necessary skills in mastering this topic are given.