Question

Thirty chairs are evenly placed around a circular table. On the table are the name cards...

Thirty chairs are evenly placed around a circular table. On the table are the name cards of thirty guests. After the guests sit down, it turns out that no one is sitting in front of his or her own card. Prove that the table can be rotated so that at least two guests are simultaneously correctly seated. Give an answer without using diagrams.

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