This paper aims to study a particular case to provide a rational basis for recognizing the existence of chance by finding its real trace, that is, specifying its practical meaning, which consists of the following statement known as the Statistical Law of Large Numbers: If an event E has a constant probability p of occurrence on any one trial, and has occurred m times in n trials, then, if the relative frequency of E, m/n, approaches the value of a limit point l and the accuracy of the approximation increases as the number of trials increases, we have l = p. The argument we propose is based on the concepts of "event" and "trial", formulated by the author himself, and their direct implications.
Keywords: Chance; Gambling System; Random Event; Statistical Law of Large Numbers; Trial.1