2. 外语
  3. One integer will be randomly selected from the integers 11 to 60, inclusive. What is the probability that the selected integer w

One integer will be randomly selected from the integers 11 to 60, inclusive. What is the probability that the selected integer w

admin2009-05-19  65
问题 One integer will be randomly selected from the integers 11 to 60, inclusive. What is the probability that the selected integer will be a perfect square or a perfect cube?
选项 A、0.1
B、0.125
C、0.16
D、0.5
E、0.9
答案A
解析 从11至60，包括11和60的整数中随机挑出一个数，问其是完全平方数(perfect square)或完全立方数(perfect cube)的概率是多少?
解：本题的正确答案为(A)。11至60间的完全平方数有16，25，36，49；完全立方数有27，共5个数，11至60之间共有50个数，所以挑出的数为完全平方数或完全立方数的概率为5/50=0.1。
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