2. 外语
  3. If an integer is randomly selected from all positive 2-digit integers, what is the probability that the integer chosen has (a)a

If an integer is randomly selected from all positive 2-digit integers, what is the probability that the integer chosen has (a)a

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问题 If an integer is randomly selected from all positive 2-digit integers, what is the probability that the integer chosen has
(a)a 4 in the tens place?
(b)at least one 4 in the tens place or the units place?
(c)no 4 in either place?
选项
答案4/5
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