Q3:
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?
A. 5
B. 6
C. 7
D. 8
E. 9
请教你们的思路?
我的思路 (0,3) 和(3,0) 2种 加 C(3,1)+C(3,2) =8种 | 
