# Chapter 1 Basics

The sample space is the set of all possible outcomes. An event is a subset of the sample space, either an outcome (simple event) or a collection of outcomes (compound event).

Events are independent if an occurrence of one has no effect on the probability of the other. Events are exclusive if $$P(AB) = 0$$. Use the multiplication rule to calculate combined probabilities for non-exclusive events ($$P(A|B) = P(A)P(B)$$ for independent events, and \$P*()(), and the addition rule to calculate combined probabilities for exclusive events.

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