问题描述:
a math question in english,who can help me with this?
A motel cleaner has 8 master keys at home to open all the rooms in a large motel.
Each room can be opened by just one of these keys.If 40% of the rooms are left
unlocked,what is the probability that the cleaner can get into a specific room if
he selects three keys at random before leaving home to go to work?
if posible,please answer in english and write down each step.
这是一个英文的数学问题
有个人他有八把钥匙,可以开所有房间的门.一天他要进去某一个房间.若果所有房间60%的门开了,他只带了其中三把钥匙(随机抽选),有多少概率可以开到那扇门?
A motel cleaner has 8 master keys at home to open all the rooms in a large motel.
Each room can be opened by just one of these keys.If 40% of the rooms are left
unlocked,what is the probability that the cleaner can get into a specific room if
he selects three keys at random before leaving home to go to work?
if posible,please answer in english and write down each step.
这是一个英文的数学问题
有个人他有八把钥匙,可以开所有房间的门.一天他要进去某一个房间.若果所有房间60%的门开了,他只带了其中三把钥匙(随机抽选),有多少概率可以开到那扇门?
问题解答:
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