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A certain club has 10 members,

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A certain club has 10 members, including Harry. One of the 10 members is to be chosen at random to be the president, one of the remaining 9 members is to be chosen at random to be the secretary, and one of the remaining 8 members is to be chosen at random to be the treasurer. What is the probability that Harry will be either the member chosen to be the secretary or the member chosen to be the treasurer?  
  • 1/720
  • 1/80
  • 1/10
  • 1/9
  • 1/5
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2017 算法工程师 大数据开发工程师 paypal
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