Statistics › Section C · Probability › Topic C.3
The addition and multiplication rules
Many probability questions ask one of three things: at least one of two events, both of them, or at least one across repeats. Each has a rule, and each question's connective words announce which tool to pick up.
In this topic
- Two workhorse rules and a shortcut
- The complement rule
- The addition rule
- The exclusive shortcut
- The multiplication rule, revisited
- Reading the question's cue words
- Combining the rules: exactly one
- Worked example: heart or face card
- Worked example: at least one six
- Common mistakes to avoid
- Key takeaways
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