2011-01-07, 11:44 PM
Don't overcomplicate things guys.
If one coin is already H, the other coin has a 50% chance of being heads or tails. The other coin is heads no matter what, so you already have Hx, x being the other coin, so the chance of them both being heads is 50% because the chance of the unflipped coin being heads is 50%, i think.
If one coin is already H, the other coin has a 50% chance of being heads or tails. The other coin is heads no matter what, so you already have Hx, x being the other coin, so the chance of them both being heads is 50% because the chance of the unflipped coin being heads is 50%, i think.