7. Six college graduates apply to three employers. If each employer hires at least one of them, the number of different hiring scenarios is $\qquad$ .


7. 2100 .

The number of ways for three people to be hired is $\mathrm{A}_{6}^{3}=120$; the number of ways for four people to be hired is $\mathrm{C}_{6}^{4} \mathrm{C}_{4}^{2} \mathrm{~A}_{3}^{3}=15 \times 6 \times 6=540$ (ways); the number of ways for five people to be hired is $C_{6}^{5}\left(C_{5}^{3} A_{3}^{3}+\frac{C_{5}^{2} C_{3}^{2}}{2!} A_{3}^{3}\right)=900$ (ways); the number of ways for all six people to be hired is $3^{6}-C_{3}^{1} \times 2^{6}+C_{3}^{2} \times 1^{6}=540$ (ways). Therefore, the total number of ways is $120+540+900+540=2100$.