A certain company assigns employees to offices in such a way that some of the offices can be empty and more than one employee can be assigned to an office. In how many ways can the company assign 3 employees to 2 different offices?
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9
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重排问题,第一个员工选2,第二个员工选2,第三个员工选2=2^3
重排问题,第一个员工选2,第二个员工选2,第三个员工选2=2^3
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