Answer: 7/8.
- A 3/8
- B 1/2
- C 7/8
- D 1/8
Correct answer: C. 7/8
Explanation: Using the complement, P(no head) = P(TTT) = 1/8, so P(at least one head) = 1 − 1/8 = 7/8.
Concept context
Random experiments, sample space, events, and the axiomatic approach to probability