Mark O. answered 06/01/18
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Hi Alycia,
If H = Heads and T = Tails, your possible outcomes are
HHH
HHT
HTH
THH
HTT
THT
TTH
TTT
There are 8 possible outcomes and only one HHT. So, the probability of HHT is 1/8 = 0.125 = 12.5%.