This is the probability of getting it with the fair coin. We want it either way. So let's add the two, which we already did in our calculator. So if you add that number to that number, you get 0.08425, and it keeps going. But I'm just going to round it. So this is the same thing as this is equal to 8.425% if I want to round it a little bit more, 8.43% chance of getting four heads in a row. And once again, that's a slightly higher number than if all of the coins were fair, because there's a 3 4th chance that I get a coin that has a better than even chance of getting heads.