4.104 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) P(A or B) is always equal to the sum of P(A) and P(B).

2. (b) The probability of an event minus the probability of its complement is always equal to 1.

3. (c) Two events are disjoint if P(B | A) = P(B).