##### Definition2.1Additive Principle

The additive principle states that if event \(A\) can occur in \(m\) ways, and event \(B\) can occur in \(n\) *disjoint* ways, then the event “\(A\) or \(B\)” can occur in \(m + n\) ways.

The additive principle states that if event \(A\) can occur in \(m\) ways, and event \(B\) can occur in \(n\) *disjoint* ways, then the event “\(A\) or \(B\)” can occur in \(m + n\) ways.

The key to this definition is understanding what *disjoint* means. Simply put, two events are disjoint if they cannot both occur in the same context.

Use the Additive Principle to solve these problems.