Which of the following statements are true?<br>1. The classical approach to probability theory requires that the total number of possible outcomes be known or calculated and that each of the outcomes be equally likely.<br>2. A marginal probability is also known as unconditional probability.<br>3. For three independent events, the joint probability of the three events, P (ABC) = P (A) × P (B/A) × P (C/AB)<br>4. Two events are mutually exclusive, exhaustive and equally likely, the probability of either event A or B or both occurring P(A or B) = P(A) + P(B)

Correct Answer: 1, 2 and 4