Apply and interpret the Addition Rule P(A or B)=P(A)+P(B)-P(A and B).
Find \(P(A or B)\) for mutually exclusive events
Problem
Because \(A\) and \(B\) are mutually exclusive, their overlap is zero. Add \(0.20\) and \(0.35\) to find \(P(A~\text{or}~B)\).
Big Picture
What this problem is really about
Mutually exclusive events have zero overlap, so the general addition rule simplifies cleanly. We’ll set the intersection term to zero, add the two disjoint probabilities, and express the resulting inclusive union in both decimal and percent form.
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