On the classical probability formula in experiments with an infinite number of outcomes

The article, intended for schoolchildren and teachers of secondary and higher schools, shows how the concept of the equiprobability of the occurrence of random events can be used in the study of experiments with unequal outcomes. In particular, it is shown how, using the correct coin, one can organize an experiment in which the probability of one of the outcomes of this experiment is equal to any preassigned number (0<p<1).