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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.
Solved.