Dept. 1 is 43%, Dept. 2 is 40%, Dept. 3 is 12%, Dept. 4 is 5% of a company

Dept. 1 is 43%, Dept. 2 is 40%, Dept. 3 is 12%, Dept. 4 is 5% of a

company. What formula would I use to calculate probability of a random employee belonging to Dept. 1, belonging to either Dept. 1 or 2, and the employee does not belong to Dept 1 or Dept 2?

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