108課綱高一下 排列組合(組合)
Synopsis
平面上有12條直線,其中5條平行,另4條共點,其餘3條任三條不共點,任兩條不平行,則由這些直線可決定: (1) 個交點。 (2) 個三角形。
![[高中數學][高一下][排列組合] EP8.1 一般排列(符號P) [楊翰數學]](https://i.ytimg.com/vi/OmSMv9qlkjQ/hq720.jpg?sqp=-oaymwEcCNAFEJQDSFXyq4qpAw4IARUAAIhCGAFwAcABBg==&rs=AOn4CLABMEuB-pVP-DRv8nlLhFW_19RF2w)
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