 |
| ||||
Home Page
F.A.Qs
Statistical Charts
Past Contests
Scheduled Contests
Award Contest
| ||||||||||
| Online Judge | Problem Set | Authors | Online Contests | User | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Web Board Home Page F.A.Qs Statistical Charts | Current Contest Past Contests Scheduled Contests Award Contest | |||||||||
Re:问一个用离散概率论求期望的问题<在线等>In Reply To:问一个用离散概率论求期望的问题<在线等> Posted by:zercal at 2008-02-18 17:37:57 > 要随机出来9个各不相等的大小为1-9的数,但不是先全部随机出来然后再判断. > 是随机每一个数时如果它跟前面的某个相等,那么就继续随机,知道随出来位置. > 那么把九个数全部随机出来的次数的期望是多少? 7129/280 > > 推广到a个1-n的数呢?期望又是多少? Followed by:
Post your reply here: |
All Rights Reserved 2003-2013 Ying Fuchen,Xu Pengcheng,Xie Di
Any problem, Please Contact Administrator
