JAMB - Mathematics (2022 - No. 4)
If a fair coin is tossed twice, what is the probability of obtaining at least one head?
0.25
0.75
0.5
0.33
ব্যাখ্যা
OR
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 ÷ 4
P = 0.75