排列組合觀念釐清
如圖片所示,有人可以講解一下第10題,和第二張圖我所提的問題嗎?謝謝
http://i.imgur.com/evvzT3i.jpg
最近自學到這一單元發現對C.P兩個定義不太明瞭,希望有人有辦法讓我想通
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