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Set K consists of 9 positive integers, 5 of which are prime numbers. How many subsets of K consist of 3 integers such that 2 integers are prime numbers and 1 integer is not a prime number?
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· 相关考点
6.3.5 组合 6.1.1 子集
6.3.5 组合
6.1.1 子集
以上解析由 考满分老师提供。
