So 50% times 50%, which is equal to 25%. Now, what is the probability that you, so if you want to know what is the probability that you picked a fair coin and you got two heads in a row? So given that you have a fair coin, it's a 25% chance that you have two heads in a row. But the probability of picking a fair coin and then given the fair coin getting two heads in a row will be the 5 8ths times the 25%. So the probability, so this whole branch, I should maybe draw it this way, the probability of this whole series of events happening. So starting with you picking the fair coin and then getting two heads in a row will be, I'll write it this way, it will be 5 8ths, 5 over 8, times this right over here, times the 0.25. I want to make it very clear.