Answer: 3/7.
- A 3/8
- B 3/7
- C 2/8
- D 1/3
Correct answer: B. 3/7
Explanation: After removing 1 good bulb, 7 remain (5 good, 3 defective wait no: 4 good, 3 defective). P(defective) = 3/7.
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