There are 3 math clubs in the school district, with 5, 7, and 8 students respectively. Each club has two co-presidents. If i randomly select a club, and then randomly select three members of that club to give a copy of $\emph{introduction to} \allowbreak\ \emph{counting and} \allowbreak\ \emph{probability}$, what is the probability that two of the people who receive books are co-presidents?.
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There are 3 math clubs in the school district, with 5, 7, and 8 students respectively. Each club has...
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