Questions.
A soccer game ended with the score 4-4. In how many ways could it have been reached, if it is known that team B never led?  (Example way: 00-10-11-21-31-32-42-43-44).
In how many ways can a hexagon be presented as a union of triangles made only of its edges and diagonals?
A confused mailman delivered 8 pieces of mail addressed to 8 houses, in such a way that no piece of mail arrived at its intended destination. In how many ways could this have been done?