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A drawer contains socks, of which 6 are white, 7 are red, and 10 are blue. Susan will randomly select socks from the drawer, one at a time and without replacement. What is the least number of socks that Susan must select in order to ensure that 2 of the socks selected are blue?
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2.5.10 抽屉问题
2.5.10 抽屉问题
以上解析由 考满分老师提供。
