# Mutually Exclusive Events

How to solve mutually exclusive events problems: formula, example, and its solution.

## Formula

Mutually exclusive events are the events

that cannot happen together.

P(*A* and *B*) = 0.

So if *A* and *B* are mutually exclusive events,

then P(*A* or *B*) = P(*A*) + P(*B*).

## Example

There's no triangle and white card.

So selecting a triangle card

and selecting an white card

are mutually exclusive events.

So P(*A* and *B*) = 0.

P(*A* or *B*) = P(*A*) + P(*B*) = 4/15 + 7/15.