Job #1 can be assigned to any of 5 employees - so there are 5 options. Job #2 can be assigned to any of 4 remaining employees - so there are 4 independent options. Job #3 can be assigned to any of 3 remaining employees - so there are 3 independent options. In all, there are 5*4*3 = 60 ways to do what the problem asks to do.