Решение задачи N4648 теория вероятностей

4648. At sports competitions, the probability of showing a record result for the first athlete is 0.5, for the second - 0.3, for the third 0.1. What is the probability that: a) the record will be set by one athlete; b) the record will be set by at least one athlete; c) the record will not be set?

Detailed solution. Decorated in Microsoft Word 2003 (Quest decided to use the formula editor)