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is the probability of getting exactly one heads.

Step-by-step explanation:

Probability : It is defined as the extent to which an event is likely to occur. That means, it is measured by the ratio of the favorable outcomes to the total number of possible outcomes.

We have : sample space = S =[HHH,HHT,HTH,HTT,THH,THT,TTH,TTT ]

Favorable outcomes of getting single head (H) = [HTT, THT, TTH]

Probability of getting single heads = P(H)

P(H) =

is the probability of getting exactly one heads.

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