SOLUTION: From a pool of 7 secretaries, 3 are selected to be assigned to 3 managers, 1 secretary to each manager. In how many ways can this be done?

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There are 7 ways to select the first secretary from the pool of 7, and once that is done, there are 6 ways to select the second secretary, and then 5 ways to select the third,

Altogether then there are 7 X 6 X 5 or 210 different ways to select the three secretaries.

Of course, that presumes that selecting secretaries 1, 4, and 7 and assigning them in that order to bosses 1, 2, and 3 is a different result from selecting them in the order 4, 7, and 1, for example.