2023
Mathematics
JAMB
A coin is thrown 3 times. What is the probability that atleast one head is obtained?
A.
7/8
B.
3/8
C.
None the above
D.
1/8
Correct Answer: 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) = 7/8
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) = 7/8THIS WEEK's
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