不过是用英语写的第一题 in a large town,one person in 80,on average,has blood of type X.how many donors must be taken at random in order that the probability of including a t least one donor of type X shall be 0.9 or more?第二题 In the q
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不过是用英语写的第一题 in a large town,one person in 80,on average,has blood of type X.how many donors must be taken at random in order that the probability of including a t least one donor of type X shall be 0.9 or more?第二题 In the q
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