This book, written by the famous American mathematician Frederick Mosteller, contains 57 entertaining problems from the field of probability theory, 50 of which are solved, and 7 are discussed. Most problems are within the capabilities of the widest range of readers, and only a few of them require knowledge of a course in analysis, but even in these cases, an untrained reader will be able to understand the statement of the problem and the answer. The solutions given in the book are no less interesting than the problems themselves. The book has gone through several editions and can be recommended to high school students, teachers, students of natural universities and all mathematics lovers.