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\begin{itemize}
\item Prob of opening door on the last key w/wo replacement.
\item Coupon collecting problem with conditional probability stressed.
\item Problem of drawing balls from an urn without looking.
\item Zero probability events in infinite sample spaces, eg
  probability of never getting a head with a fair coin.
\item Paradox, of picking envelopes and switching to the higher one.
\end{itemize}


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