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
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9
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第一个人有2种选择,第二个人第三个人也是有2种选择,所以是2×2×2=8 类似于3封信投递到2个邮箱,考虑信而不是信箱。
第一个人有2种选择,第二个人第三个人也是有2种选择,所以是2×2×2=8
类似于3封信投递到2个邮箱,考虑信而不是信箱。
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