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No. of times coin is tossed$=3$.

A chance process' sample space$S$ is the collection of all potential outcomes. A probability model is a two-part description of a random process that includes a sample space$S$ and probabilities for each result.

The possible ordered outcomes are listed as elements in a sample space, which is commonly indicated using set notation. A sequence of three fair coins' sample space contains all conceivable outcomes sequences$=2^3$

To put it another way, the sample of a fair coin is $\left\{H,T\right\}$

$\left\{HHH,HHT,HTH,HTT,THH,THT,TTH,TTT\right\}$

A sequence of three fair coins' sample space contains all conceivable outcomes sequences$=2^3$

To put it another way, the sample of a fair coin flip is $\left\{H,T\right\}$

$\left\{HHH,HHT,HTH,HTT,THH,THT,TTH,TTT\right\}$

Because there are $8$possible outcomes in the specified sample space, a fair coin is tossed three times. As a result, all of the events in the specified sample space have the same probability. As a result, the likelihood $=\frac{1}{8}$.