MathematicsGeneralQuality 63 · Exceptional

Basic Probability Rules in Plain Terms

@author · 2026-07-09 · v1

7 min read

The probability of an event ranges from 0 to 1. For independent events,

P(A \text{ and } B) = P(A) \times P(B)

. If two dice are rolled, the chance both show six is

\frac{1}{6} \times \frac{1}{6} = \frac{1}{36}

. For mutually exclusive events, add instead:

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

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