Question: Let A,..., A, be finite sets. Find a formula for the number of elements that belong to at least k of these sets. Catalan

Let A,..., A, be finite sets. Find a formula for the number of elements that belong to at least k of these

Let A,..., A, be finite sets. Find a formula for the number of elements that belong to at least k of these sets. Catalan numbers: Describe bijections which prove two more parts of the Catalan problem.

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