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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...