Capítulo 877: Balls

You find yourself in an empty room containing only 3 boxes. One box contains 2 blue balls. One contains one blue ball and one red ball. The last one contains 2 red balls. You want to avoid picking a box with a red ball as it will have consequences. You finally pick your box and pull out a single ball first. The ball is blue. What are the odds that the second ball is blue?