Let $P = (\Omega, \mathcal{F}, \mathbb{P})$ be a D1159: Probability space such that
| (i) | $E, F \in \mathcal{F}$ are each an D1716: Event in $P$ |
Then
\begin{equation}
\mathbb{P}(E \cup F)
= \mathbb{P}(E) + \mathbb{P}(F \setminus E)
\end{equation}