A company has three departments: Marketing, Finance, and IT$.$ There are $10$ employees in the Marketing department, $7$ employees in the Finance department, and $8$ employees in the IT department. A company event is being planned, and the organizer wants to select $6$ employees from the company to form a team. What is the probability that the selected team will have at least one employee from each department? Need to know how to write python code to solve problem using intertools.combinations function.