Answer: Exactly k failures before r-th success.
- A Exactly k failures before r-th success
- B Exactly k successes in n trials
- C Time between events
- D First success on trial k
Correct answer: A. Exactly k failures before r-th success
Explanation: Negative Binomial: number of failures before r-th success (or k-th success on specified trial), generalizing geometric distribution.
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