A coin is thrown 3 times. What is the probability that atleast one head is
MATHEMATICS
JAMB 2023
A coin is thrown 3 times. What is the probability that atleast one head is obtained?
- A. \(\frac {7}{8}\)
- B. \(\frac {3}{8}\)
- C. None the above
- D. \(\frac {1}{8}\)
Correct Answer: A. \(\frac {7}{8}\)
Explanation
Sample space = {HHH, HHT, HTH, THH, TTH, THT, HTT, TTT}
Total number of possible outcomes = 2 x 2 x 2 = 8
favourable number of outcomes = 7
∴Pr(at least one head) = \(\frac {7}{8}\)
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