一對男女隊都有均等機會做在任意的兩個不同的座位上
(2n-1) / (2n * (2n-1)/2) = 1/n
一對男女隊都有均等機會做在任意的兩個不同的座位上
(2n-1) / (2n * (2n-1)/2) = 1/n
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