Based on the motives - (Always surprised - in 3 courses of Eastfak teach mathematics?! Especially with such teachings:
There are 5 white and 6 black balls in the basket. They get 3 balls. What is the probability that they are all different?! to
Sit down to decide...

Hey, we have on the theory of probability the pad wet:"In the basket there are 15 balls, 7 with vertical stripes, and 8 with horizontal.....