[DM] 94中央資管排列組合 find the number of ways to assign 4 jobs to 3 works so that each jobget a worker and each worker gets at least one job. 原題題目為相異物品要放入相異的箱子裡，不允許有空箱。所以帶入 Onto(m,n) 的公式。本題也可以利用生成函數法來解，可參考黃子嘉離散數學上冊 P.4-30頁。Ans: onto(4,3) .msgcontent .wsharing ul li { text-indent: 0; } 分享 Facebook Plurk YAHOO! .
