Last Updated Sep 27, 2025

Mutually Exclusive Events Simplified Revision Notes for Leaving Cert Mathematics

Revision notes with simplified explanations to understand Mutually Exclusive Events quickly and effectively.

Learn about Events for your Leaving Cert Mathematics Exam. This Revision Note includes a summary of Events for easy recall in your Mathematics exam

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Mutually Exclusive Events

Mutually Exclusive Events

Events are mutually exclusive if they cannot occur at the same time.

If $A$ and $B$ are mutually exclusive, then:

$$P(A \text{ or } B) = P(A) + P(B)$$

infoNote

Example: The probability of rolling either a 1 or a 2 on a 6-sided die:

$$P(\text{rolling a 1 or 2}) = P(1) + P(2)$$$$\frac{1}{6} + \frac{1}{6} = \frac{2}{6} = \frac{1}{3}$$

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