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GRE数学解析(12)
2018-02-08 13:56
来源:新东方在线
作者:
解析
答案:A
解析:分子的表达方式是从5个盘子中选2个,一共有10种选法,然后有3个不同的set,所以再乘以3,所以分子是30,分母是从15个盘子中选2个,算出来是105,所以最终答案是30/105=2/7。
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