A mechanic shop has 20 employees. Three of the employees are certified to work on Toyota vehicles: Shelby, Jamie, and Brad. Four of the employees are certified to work on GM vehicles: Shelby, Jamie, Tony, and Craig. The shop often overbooks Shelby and Jamie because they are qualified in both vehicle types. Create a table and use the addition law to show the union of two events and that a worker assigned to a job is certified in either Toyota, GM, or both types of vehicles. To receive full credit, show both your work and final answer. Use the letter u for union and the letter n for intersection when typing formulas.