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023概率困难数值题medium

Tournament Bracket with Seating Constraints

题目

In a round-robin chess mini-tournament, 5 players are randomly assigned to 5 boards (one player per board, all 5!5! assignments equally likely). The boards are numbered 11 through 55 in a circle, so board 66 wraps to board 11. Player ii has a "comfort zone" consisting of boards ii and i+1i{+}1 (cyclically: player 5's comfort zone is {5,1}\{5, 1\}). The organizer wants every player to be outside their comfort zone. Find P(no player is assigned to a board in their comfort zone)P(\text{no player is assigned to a board in their comfort zone}).

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