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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
参考答案
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。
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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