[閒聊] 兩個以上的女生有幾個小圈圈？ queen100000 PTT批踢踢實業坊

[閒聊] 兩個以上的女生有幾個小圈圈？

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

https://twitter.com/kagawayusaku/status/1372927132951711745?s=19
https://i.imgur.com/Vw5z4t9.jpg
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Ans：無限多個

作者: SSCSFE (　) 2021-03-20 16:19:00

2^n - n - 1個 (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

拜託高中不要再考庭院深深深幾許那種大便問題了考這種才是真正把排列組合運用在生活中

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

無限多個我看過同個小圈圈每個月都不同風氣的很恐怖

作者: redDest (油宅) 2021-03-20 16:21:00

樓下跟女生disjoint

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

Sigma(n,i=1)C(n,i)個