One hundred percent it you toss the coin eight times.
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It is 1/8 = 0.125
There are 23 or 8 possibilities; one is HHH. So, probability of HHH is 1/8 or 0.125.
It is (1/2)3 = 1/8 or 0.125
Hhgh
Ideally, the probability of getting any specific combination of length n is 0.5n = 1/2n. For n = 3, this is 0.125 = 1/8.