Black or White?
I just found this one. I’m posting it as an extra special treat for Eketahuna who loves this sort of thing
A box contains three cards. One card is black on both sides, one card is white on both sides, and one card is black on one side and white on the other. One card is selected from the box at random, and one side is inspected. If this side is black, what is the probability that the other side of the card is black as well?