Mutually exclusive events are events that cannot happen at the same time. If one event occurs, the other cannot.
The intersection is always zero — no shared outcomes.
Click the die to roll!
The addition law gives P(A or B), depending on whether the events overlap.
✅ If A & B are Mutually Exclusive:
❌ If A & B are NOT Mutually Exclusive:
Subtract P(A∩B) to avoid counting the overlap twice — this is the General Addition Law.
One day picked from a week. Find P(starts with W or T).