Answer:
Purchasing a new car and purchasing a used car are disjoint events.
Explanation:
Disjoint Events are events which do not have common outcomes.
In the given question there are two possibilities of purchasing the vehicle one is used vehicle and the other is new vehicle. These possibilities are disjoint as they do not have the same outcomes and probabilities. One has a probability of 0.5 and the other has probability of 0.4.
The probability of not buying a used vehicle is 0.6