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This is a brief article on probability that includes interpretations of probability and a few probability rules: the addition rule, the inclusion-exclusion rule, and the law of total probability.
This is a very short article that just states the axioms of probability: positivity, total probability 1, and finite and countable additivitiy over disjoint events.
This is the first in a series of Wikipedia articles on probability. This article briefly discusses the history, philosophy, etymology, mathematical theory, and applications of the subject.

This is a brief article on Boole's inequality, which gives an upper bound on the probability of countable collection of events.

This applet shows two events $$A$$ and $$B$$ as squares within a larger square that represents the sample space.
Overview of Monty Hall problems including original letter to Marilyn vos Savant. Some variations are given.

Official "Let's Make a Deal" site. References to the Monty Hall problem in other popular media including movies, television shows, newspapers, and books are given.

Concise explanation of Monty Hall problem with a written explanation of the solution.
This is the second in a series of lessons on probability in the Math Goodies site.
Simple, clean graphics for a simulation of Monty Hall problem. Percentages for switch-win, switch-lose, stay-win, stay-lose are collected.