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标题: 陈向东数学中的概率题 [打印本页]

作者: missouyang    时间: 2006-6-22 06:50     标题: 陈向东数学中的概率题

陈向东数学中的概率题,请教大家:

有三名打字员为4个科室打字,如果4个科室有一份文件要打,各科室打字员的选择是随机的,问每个打字员都收到文件的概率?

请教思路。


作者: taohuaxianzi    时间: 2006-6-23 20:16

Probability of everyone having received work
= (# of ways for everyone to have some work) / (# of ways to arrange the work)
= (# of ways for 1 person getting 2 files + 2 people each getting 1 file) / (# of ways to distribute the 4 files)

作者: xiongxiong88    时间: 2006-6-26 13:15

4个科室共有一份文件是么
作者: missouyang    时间: 2006-6-28 13:13

many  thanks !!!!!!!




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