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Lottery balls numbered consecutively from 1 through 100 are placed in a spinner. If one ball is drawn at random, what is the pro
Lottery balls numbered consecutively from 1 through 100 are placed in a spinner. If one ball is drawn at random, what is the pro
admin
2011-01-18
108
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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