b***k
发帖数: 2673 | 1 ☆─────────────────────────────────────☆
littleegg (爱吃茶叶蛋) 于 (Sun Jun 8 14:39:07 2008) 提到:
(1)suppose there are n people in an office, at Christmas, they have a random
gift exchange in which every name is written on scrapes of paper, mixed
around in a hat, then everyone draws a name at random to determine who they
are to get a gift for. What is the probability nobody draws their own name?
(2)what is the expected number of random numbers, uniformly distributed from
0 to 1 needed to the sum t |
|
