Answer: 7/8.
- A 1/8
- B 3/8
- C 7/8
- D 1/2
Correct answer: C. 7/8
Explanation: P(no head) = 1/8, so P(at least one) = 1 − 1/8 = 7/8.
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