К06ылв! 8лвдимерский тяже0803, Ukraine

This IP/site has been noticed in repeated unauthorized copying of ads from a g r o - u k r a i n e . c o m

Riga. Mathematics lesson on January 12, 2006. The lesson was the 9th one...

Teacher: - New topic. Combinatorics.(//tractor-service.com)

Everything is recorded.

Teacher: - Let's start with the task. You have three different posters - blue, red and green. How many ways can they be hung on the wall? Mouse, go to the board!

Student (Sasha, blonde): - Yes, there are many ways! With tape, glue, nails...