Three workplaces

How many ways can we divide nine workers into three workplaces if they need four workers in the first workplace, 3 in the second workplace and 2 in the third?

Correct result:

n =  1260


n=9!4! 3! 2!=1260n=\dfrac{ 9! }{ 4! \cdot \ 3! \cdot \ 2! }=1260

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Showing 2 comments:
Math student
I presume that the solution is not correct.

Math student
Found my mistake.


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