Probability

#1
100 employees of a company are asked how they get to work and whether they work full time or part time. The figure below shows the results. If one of the 100 employees is randomly selected, find the probability that the person drives alone or cycles to work.

1. Public transportation:10 full time, 9 part time
2. Bicycle: 3 full time, 3 part time
3. Drive alone: 29 full time, 30 part time
4. Carpool: 7 full time, 9 part time

would this be p(drive alone)+ P(cycle) - (Public transportation+ carpool)?