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【OG20-P277-277题】
In a real estate office that employs n salespeople, f of them are females and x of the females are new employees. What is the value of n ?(1)If an employee were randomly selected from the n employees, the probability of selecting a female would be 23 (2)If an employee were randomly selected from the f female employees, the probability of selecting a new employee would be 12
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条件1:f/n=2/3,f未知,不充分
条件2:x/f=1/2,不充分
结合:不充分
题目讨论 (10条评论)

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ziqi
还以为f已知。。。
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0 回复 2022-03-12 11:20:54
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虫0515
救命,f和x居然是未知...
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0 回复 2021-10-03 21:01:43
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杀鸡大户回复虫0515
离了大谱就是说。。
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0 回复 2022-01-21 23:19:37
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青蛙菌x
f居然是未知
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0 回复 2021-04-08 23:04:50
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428733rqom
刚开始时候怀疑自己,怎么会有这么弱智的题……
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0 回复 2020-11-08 11:23:49
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568588kopd回复428733rqom
然后发现。。。
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0 回复 2022-01-10 23:21:58
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Jayden8
这样考有意思?
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1 回复 2020-08-12 11:18:09
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emily666
这也可以。。
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0 回复 2020-03-17 20:43:38
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Stanley想去荷兰
有毛病吧,f不是已经给出了吗?
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0 回复 2019-12-28 14:07:02
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571661zxzq回复Stanley想去荷兰
f未知,不知道f具体value是多少
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0 回复 2020-08-18 12:08:06
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prayer
这怎么确定f算已知还是未知啊……
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0 回复 2019-07-18 11:18:13
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210457ynqsj回复prayer
同问
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0 回复 2019-08-16 11:12:05
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331637w回复prayer
同问。。。。
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0 回复 2020-11-15 21:23:54
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Appler
+1 哭晕
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0 回复 2019-01-11 23:32:44
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独一无二的张喜喜
我竟然把f当成已知处理了,,,,唉 因为没有任何给定的准确数字,所以无论如何都是算不出的 选e
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0 回复 2018-12-30 16:02:13