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MATHEMATICS

JAMB 2022 - Question 33

Mathematics 2022 JAMB Past Questions - Question 33: If a fair coin is tossed twice, what is the probability of obtaining at least one head?

If a fair coin is tossed twice, what is the probability of obtaining at least one head?

A: 0.25

B: 0.75

C: 0.5

D: 0.33

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Correct Answer

Explanation

When a coin is tossed twice, the sample space is given by S ={HH HT TH TT} and the event of obtaining at least a head is provided by A ={HH HT TH}.Therefore the probability of getting at least a head is given by:P = n(A) ÷ n(S)P = 3 ÷ 4P = 0.75