[闲聊] 两个以上的女生有几个小圈圈？ queen100000 PTT批踢踢实业坊

[闲聊] 两个以上的女生有几个小圈圈？

楼主: queen100000 (queen) 2021-03-20 16:16:59

https://twitter.com/kagawayusaku/status/1372927132951711745?s=19
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Ans：无限多个

作者: SSCSFE (　) 2021-03-20 16:19:00

2^n - n - 1个 (n>1)

作者: Ericz7000 (Ericz7000nolan) 2021-03-20 16:19:00

2^n - 1 - n

作者: abadjoke (asyourlife) 2021-03-20 16:20:00

拜托高中不要再考庭院深深深几许那种大便问题了考这种才是真正把排列组合运用在生活中

作者: k960608 (雾羽‧浪沙) 2021-03-20 16:20:00

无限多个我看过同个小圈圈每个月都不同风气的很恐怖

作者: redDest (油宅) 2021-03-20 16:21:00

楼下跟女生disjoint

作者: zuiko (病娇白露型提督) 2021-03-20 16:23:00

Sigma(n,i=1)C(n,i)个