Larunatrecy @ 2021-10-18 12:32:49
有n个物品，抽到第i个物品的概率是
by Shen_Linwood @ 2021-10-18 12:53:54
@焦思源 抽完是拿出来还是放回去？
by Aa0815 @ 2021-10-18 12:55:32
@shenlw 必然是放回去吧？
by Shen_Linwood @ 2021-10-18 12:58:20
@Aa0815 哦哦哦的确 我是傻逼
by Larunatrecy @ 2021-10-20 10:16:51
那请问这个期望怎么算呢
by Larunatrecy @ 2021-10-20 10:17:20
@shenlw 那请问这个期望怎么算呢
by Larunatrecy @ 2021-10-20 10:17:49
@Aa0815 那请问这个期望怎么算呢
by Shen_Linwood @ 2021-10-20 10:43:37
@焦思源 emm有点麻烦
by Shen_Linwood @ 2021-10-20 10:49:10
可能有无穷多种情况
by Shen_Linwood @ 2021-10-20 11:00:22
可以试试等比数列无穷求和
by Larunatrecy @ 2021-10-20 11:07:06
@shenlw 期望DP行吗