作者thank1984 (thankakimo)
看板Grad-ProbAsk
標題[理工] 離散-組合
時間Sun Mar 22 17:59:15 2009
題目:A committee of six is to be made from four students and eight teachers.
How many ways can the followings be done??
a) If the committee contains exactly three students?
b) If the committee contains at least three students?
問題: 請問各位大大這題要怎麼解呢?? 煩請解答 感謝
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◆ From: 122.116.171.19
1F：推 dasmond:就排列組合阿 ~''~ 03/22 18:24
2F：→ thank1984:a)是4取3 * 8取3? b)是 12取6 - 8取6 - 4取1*8取5 - 03/22 18:28
3F：→ thank1984:4取2*8取4?? 03/22 18:28
4F：推 s987692:a.c(4,3)*c(8,3) b. c(4,3)*c(8,3)+c(4,4)*c(8,2) 03/22 19:46
5F：→ thank1984:嗯嗯 感謝S大解答 03/22 20:36