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The Multiplication Principle
If E1 and E2 are two events, and E1 can occur in m ways and once E1 has occured, E2 can occur in n ways, then E1, E2 can both occur in (m x n) ways.
The Addition Principle
If E1 and E2 are disjoint events (i.e. mutually exclusive) and E1 happens in m ways and E2 happens in n ways, then E1 or E2 can happen in (m + n) ways.
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