2. 职称英语
  3. Lottery balls numbered consecutively from 1 through 100 are placed in a spinner.

Lottery balls numbered consecutively from 1 through 100 are placed in a spinner.

游客2024-01-14  9
问题 Lottery balls numbered consecutively from 1 through 100 are placed in a spinner. If one ball is drawn at random, what is the probability that it will have the number 1 on it exactly once?
选项 A、 
B、 
C、 
D、 
E、 
答案 D
解析 The balls with the number 1 on them exactly once are 1, 10, 12, 13, 14, 15, 16, 17, 18, 19, 21, 31, 41, 51, 61, 71, 81, 91, and 100. Count them up and we get 19 balls out of 100.
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