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 assignments equally likely). The boards are numbered through in a circle, so board wraps to board . Player has a "comfort zone" consisting of boards and (cyclically: player 5's comfort zone is ). The organizer wants every player to be outside their comfort zone. Find .
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