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authorJulian T <julian@jtle.dk>2021-06-04 13:00:07 +0200
committerJulian T <julian@jtle.dk>2021-06-04 13:00:07 +0200
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-\title{Eksamnens Noter}
-
-
-The universal set or sample space is the set everything, and is denoted $S$.
-Therefore the probability of hitting $S$ is $P(S) = 1$.
-
-This is the first of 3 axioms repeated below.
-
-\begin{enumerate}
- \item For any event $A$, $P(A) \geq 0$.
- \item The probability of hitting sample space is always 1, $P(S) = 1$.
- \item If events $A_1, A_2, ...$ are \textbf{disjoint} event, then
- \begin{equation}
- P(A_1 \cup A_2 ...) = P(A_1) + P(A_2)\,.
- \end{equation}
-\end{enumerate}
-
-The last axiom requires that the events $A_n$ are disjoint.
-If they aren't one should subtract the part they have in common.
-This is called the \emph{Inclusion-Exclusion Principle}.
-
-\begin{principle}
- The \emph{Inclusion-Exclusion Principle} is defined as
- \begin{equation}
- P(A \cup B) = P(A) + P(B) - P(A \cap B)\,.
- \end{equation}
- Definition with 3 events can be found in the in the book.
-\end{principle}
-
-\section{Counting}
-
-The probability of a event $A$ can be found by
-\begin{equation}
- P(A) = \frac {|A|} {|S|}\,.
-\end{equation}
-It is therefore required to count how many elements are in $S$ and $A$.
-The most simple method is the \emph{multiplication principle}.
-
-\begin{principle}[Multiplication principle]
- Let there be $r$ random experiments, where the $k$'th experiment has $n_k$ outcomes.
- Then there are
- \begin{equation}
- n_1 \cdot n_2 \cdot ... \cdot n_r
- \end{equation}
- possible outcomes over all $r$ experiments.
-\end{principle}
-