I have 3 boxes. One box contains 2 silver coins. One box contains 2 gold coins. One box contains a silver and a gold coin.
I reach into Box 1 and pull out a silver coin. I reach into Box 2 and pull out another silver coin. What is the chances that Box 3 contains 2 gold coins?
I reach into Box 1 and pull out a silver coin. I reach into Box 2 and pull out another silver coin. What is the chances that Box 3 contains 2 gold coins?