JBMO-SL 2011 C4
- Answer
In a group of people, each one had a different ball. They performed a sequence of swaps; in each swap, two people swapped the ball they had at that moment. Each pair of people performed at least one swap. In the end each person had the ball he/she had at the start. Find the least possible number of swaps, if: ) ; b) .
Dataset text NuminaMath olympiads. Quoted with source.
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