# Factorial - 9th grade (14y) - examples

1. Bookshelf and books
How many can we place 7 books in a bookshelf?
2. Vans
In how many ways can 9 shuttle vans line up at the airport?
3. Seating
How many ways can 6 people sit on 3 numbered chairs (e. G. , seat reservation on the train)?
4. Guests
How many ways can 5 guests sit down on 6 seats standing in a row?
5. Shelf
How many ways are there to arrange 6 books on a shelf?
6. Playing cards
How many possible ways are to shuffle 7 playing cards?
7. Pairs
At the table sit 8 people, 4 on one side and 4 on the other side. Among them are 3 pairs. Every pair wants to sit opposite each other. How many ways can they sit?
8. Kids
How many different ways can sit 8 boys and 3 girls in line, if girls want to sit on the edge?
9. Commitee
A class consists of 6 males and 7 females. How many committees of 7 are possible if the committee must consist of 2 males and 5 females?
10. Hockey players
After we cycle five hockey players sit down. What is the probability that the two best scorers of this crew will sit next to each other?
11. Numbers
How many different 7 digit natural numbers in which no digit is repeated, can be composed from digits 0,1,2,3,4,5,6?
12. Combi-triangle
On each side of the square is marked 10 different points outside the vertices of the square. How many triangles can be constructed from this set of points, where each vertex of the triangle lie on the other side of the square?
13. Elections
In elections candidate 10 political parties. Calculate how many possible ways can the elections finish, if any two parties will not get the same number of votes.
14. Math logic
There are 20 children in the group, each two children have a different name. Alena and John are among them. How many ways can we choose 8 children to be among the selected A) was John B) was John and Alena C) at least one was Alena, John D) maximum one w
15. Friends in cinema
5 friends went to the cinema. How many possible ways can sit in a row, if one of them wants to sit in the middle and the remaining's place does not matter?
16. Tournament
Determine how many ways can be chosen two representatives from 34 students to school tournament.
17. Words
How many 3 letter "words" are possible using 14 letters of the alphabet? a) n - without repetition b) m - with repetition
18. Olympics
In how many ways can be placed 6 athletes on the podium at the Olympics? Depend on the color of the metal.
19. MATES
In MATES (Small Television tipping) from 35 randomly numbers drawn 5 winning numbers. How many possible combinations there is?
20. Football league
In the football league is 16 teams. How many different sequence of results may occur at the end of the competition?

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