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Home / A-Level / Maths / Statistics 2 / Probability / Probability Formulae

Probability Formulae

\[P(A\cup B)=P(A)+P(B)-P(A\cap B)$$ $$P(A|B)=\frac{P(A\cap B)}{P(B)}\]

Mutually Exclusive Events

\[P(A\cap B)=0$$ $$P(A\cup B)=P(A)+P(B)$$ $$P(A|B)=0\]

Independent Events

\[P(A|B)=P(A)$$ $$P(A\cap B)=P(A)P(B)\]

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