4.21 What’s wrong? In each of the following scenarios, there is something wrong. Describe what is wrong and give a reason for your answer.

1. (a) If two events are disjoint, we can multiply their probabilities to determine the probability that they will both occur.

2. (b) If the probability of A is 0.7 and the probability of B is 0.5, the probability of both A and B happening is 1.2.

3. (c) If the probability of A is 0.45, then the probability of the complement of A is −0.45.