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?
5
6
7
8
9
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类似于3封信投递到2个邮箱,考虑信而不是信箱。
OR
3C3 *2 + 3C1*2C2*2 = 2 + 6 = 8