单选题If one title is selected at random out of the total inventory, the chance that the title is available in print in both paperback and hardcover is ______.A5 out of 30B7 out of 30C18 out of 30D23 out of 30

单选题
If one title is selected at random out of the total inventory, the chance that the title is available in print in both paperback and hardcover is ______.
A

5 out of 30

B

7 out of 30

C

18 out of 30

D

23 out of 30


参考解析

解析:
两圆重叠部分中的符号代表的是即可用于平装书也可用于精装书的书名,这样的符号共有5个,也就是说3000个书名中共有500个可同时用于平装书和精装书,因此概率为5\30。

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