The document provides information about probability theory and its history. It discusses how probability theory originated in the 16th century with the first book on the subject written by an Italian physician. It then describes some of the major mathematicians like James Bernoulli, Abraham de Moivre, and Pierre-Simon Laplace who made significant contributions to developing the field of probability theory. More recently, probability has been applied extensively in various areas like biology, economics, genetics, and physics. The document also provides basic definitions and properties of probability like how to calculate the probability of an event and the complement of an event. It includes some examples demonstrating how to calculate probabilities.