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The budget of 5 countries are 0.7 billion, 1.3 billion, 1.7 billion, 2.7 billion and 3.2 billion, respectively. In how many ways can you select 3 countries from all the countries such that the total budget of these 3 countries is over 4 billion?
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· 相关考点
6.3.5 组合
6.3.5 组合
以上解析由 考满分老师提供。
