Determine the probability of tossing a head, Mathematics

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Q. Determine the probability of tossing a head?

Let B represent the event of tossing a heads with the nickel in example 2. Find P(B).

Solution: 
S = {(H, H), (H, T), (T, H), (T, T)}
n(S) = 4

To list B, we find all of the sample points in S that have H as the first coordinate.
B = {(H, H), (H, T)}
n(B) = 2

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