A seemingly simple decision—how to distribute one hundred balls into two boxes—hides a strategy that defies instinct. It's worth stopping before handing out.
White balls in two boxes
Riddle statement
You have 50 white balls and 50 black ones.
You must distribute them into two boxes, with the only condition that none of them remain empty. Then one of the two boxes is chosen at random and, from that box, a ball at random.
How should you distribute the balls to maximize the probability of getting a white one?