Probability does not seem too complicated at first glance. You know that, of course: A cube has six sides. So in a sixth of all cases, a six is rolled.
We do not want to roll dice today, we want to draw cards. There are three different ones in a hat. One is blue on both sides, one red on both sides and one blue on one side and red on the other.
Now close your eyes, reach into the hat and randomly draw one of the three cards. These are laid on the table, still with their eyes closed.
You open your eyes and see that the top of the card is red.
How big is the probability that the backside is red too?