there's 11 people for the 1st position. then, no matter who gets it, there's only 10 left for the second, and then 9 left for the third. 11 x 10 x 9 = 990. the answer is there are 990 different ways the positions can be filled by these applicants
so they can see what that city is producing and to also see if they can some how get that product. like gold in africa.