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.

Videos from Khan Academy. Covers many topics from an introductory class, including independent and dependent events, basic counting, expected value, and the law of large numbers.

This is one in a series of lessons on probability from the Math Goodies site. The definition of conditional probability is given along with several examples from a variety of settings.

This is a short article on dependence and independence of two events. The ideas are discussed in the context of the conditional probability of one event given another.