|
- 精华
- 0
- 积分
- 73
- 经验
- 73 点
- 威望
- 0 点
- 金钱
- 198 ￥
- 魅力
- 103
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bush那题的又一变体
Totally 10 people, including Harry. Pick 1 out of 10 for president, then pick 1 out of 9 for secretary, pick 1 out of 8 for treasurer. What is the probability that Harry will be picked for either secretary or treasurer?
请问答案是否为1/5 |
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