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How many matches does “everyone plays everyone” require?

Five entrants in a single round-robin tournament each have four opponents. That looks like 20 matches until you notice that A against B and B against A describe the same meeting. Counting each pair once gives 10 matches, a different question from how many rounds or days the event needs.

3–5 min

Questions you could explore

  • What changes if every pair plays twice instead?

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How many matches does “everyone plays everyone” require? | Speech Topic | speaking.app