[求助] 排列組合物品不夠分的教法
有3個不同信封，投進給7個郵筒，每個郵筒最多放一個信封，共有幾種分法?
(A)3 (B)7 (C)21 (D)210
7
Ans : P
3
在講相異物直線排列的時候
都是多的物品分給位置
今天郵筒很多
變成要把信封當成位置 郵筒當物品
想請問要如何跟學生說明呢
有沒有比較好的講法
謝謝!!
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