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[PS] Finish basic summary
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\subsection{Kombinationen}
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{\scriptsize Auf wieviele Arten kann man $k \leq n$ von $n$ Objekten auswählen?}
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\bi{Ohne Zurücklegen} ${n \choose k} = \frac{n!}{k!(n - k)!}$;
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\bi{Mit} ${n + k - 1 \choose k}$
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