標題:
[Core]
有冇人識計
[打印本頁]
作者:
aryan06
時間:
2019-6-2 05:01 PM
標題:
有冇人識計
9 students will be placed randomly on 13 chairs in a row, find the probability that no two empty chairs will be adjacent.
答案係42/143
有冇人可以解答,thanks
作者:
hazzalfred
時間:
2019-6-2 06:11 PM
(10C4)/(13C9)
當將4個empty seats放喺9個人之間 _為空位
_1_2_3_4_5_6_7_8_9_
所以10個空位裡面放4 ,10C4
13C4就喺total number of ways
作者:
aryan06
時間:
2019-6-2 06:40 PM
Thanks so much
歡迎光臨 小卒資訊論壇 (http://www.lsforum.net/board/)
Powered by Discuz! 6.0.0