Question 980399
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Depends.  Does order matter?  Are you filling 3 sales clerk positions, so it doesn't matter which person goes in which position, or are you filling one each sales clerk, receptionist, and delivery driver position? 


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Update:  Student clarified the question.  Order does not matter.


So the answer is the number of combinations (not permutations) of 12 things taken 3 at a time.


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ {{12}\choose{3}}\ =\ \frac{12!}{9!\cdot 3!}\ =\ \frac{12\ \times\ 11\ \times\ 10}{3\ \times\ 2}]


You can do your own arithmetic.


John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it

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