Answer: 3/8.
- A 3/8
- B 6/16 = 3/8
- C 1/4
- D 5/16
Correct answer: A. 3/8
Explanation: P(X=2) = C(4,2) × (1/2)² × (1/2)² = 6/16 = 3/8.
Venn diagram of the universal set U with events A and B, showing the intersection (A and B), the parts unique to each event, and the complement region outside both.
Concept context
Chance, events, conditional probability, and Bayes theorem