If a fair coin is tossed twice what is the prob... - JAMB Mathematics 2022 Question
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
correct option: b
S=HH, HT, TH, TT
We can get the result by subtracting the probability of getting no heads with 1.
That is, the probability of getting at least one head = 1 minus the probability of getting no heads:
P=1−1/4
= 3/4
= 0.75
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