Seated in a Ford Falcon are 4 males and 2 females. Seated in a Holden Commodore are 2 males and 1

female. One of the cars is randomly stopped by the police and one person from the vehicle is randomly

selected.

Draw a tree diagram to illustrate the situation and calculate the probability that:

a. The person selected by the police is female

b. If a female is selected by the police, she was sitting in the Ford.