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  1. Math_QED

    Counting problems: dancing couples & books and children

    Homework Statement 1) We choose randomly 10 persons from 10 dance couples, but we need at least one dance couple. In how many ways is this possible? 2) If we divide n+1 books among n children and every child has to get at least one, in how many ways would this be possible? Homework Equations...
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