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Recreational mathematics or puzzles with serious mathematical content. Note that math contest problems are generally considered off-topic.

9 votes
1 answer
1k views

How many ways to partition a group of people?

My friend (who is a medical student!) posed me the following question: There are 70 people, and you want to split them up into 10 groups of 7 people each. Two such partitions are "compatible" if no t …
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