Math Problem Statement
三个有三只脚的斯坦福人脱下他们的袜子并互相交换。如果每个人最终都恰好有三只袜子,且没有人得到自己的袜子,有多少种可能的交换方式?所有来自斯坦福人的袜子彼此之间都是可区分的。所有斯坦福人的脚对于同一个人来说都是不可区分的。
Solution
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Math Problem Analysis
Mathematical Concepts
Combinatorics
Derangements
Permutation
Formulas
Derangement formula: D(n) = n! (1 - 1/1! + 1/2! - 1/3! + ... + (-1)^n/n!)
Theorems
Derangement Theorem
Suitable Grade Level
Undergraduate level
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