Probability, also known as "probability", reflects the probability of random events. Random events refer to events that may or may not occur under the same conditions. For example, it is a random event to randomly select one from a batch of goods with genuine products and defective products, and "what is extracted is genuine products".
Suppose a random phenomenon is tested and observed n times, in which event A appears m times, that is, its frequency is m/n. After a lot of repeated experiments, m/n is often closer to a constant (see Bernoulli's law of large numbers for details). This constant is the probability of the occurrence of event A, which is usually expressed by P (A).
The first person to calculate the probability systematically was cardano in the 6th century/kloc-0. This is recorded in his book. The content of probability in the book was translated from Latin by Gould.
Cardano's mathematical works contain many suggestions for gamblers. These suggestions are all written in the essay. However, it was in a series of letters between Pascal and Fermat that a systematic study of probability was first put forward. These communications were originally put forward by Pascal, who wanted to ask Fermat some questions about Chevalier de Meyer. Chevalier de Meyer is a famous writer, an outstanding figure in the court of Louis XIV, and an avid gambler. There are two main problems: the problem of rolling dice and the problem of bonus distribution in the competition.