# Factorial + multiplication - 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. Candy
How many ways can divide 16 identical candies to 4 children?
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. School trip
The class has 19 students. What different ways students can be accommodated in the hostel, where available 3× 2-bed, 3× 3-bed and 1× 4-bed rooms. (Each room has its unique number)
11. 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?
12. 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
13. 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?
14. Seating rules
In a class are 24 seats but in 7.B class are only 18 students. How many ways can student seat? (The class has 12 benches. A bench is for a pair of students.) Result (large number) logarithm and thus write down as powers of 10.
15. Words
How many 3 letter "words" are possible using 14 letters of the alphabet? a) n - without repetition b) m - with repetition
16. Committees
How many different committees of 6 people can be formed from a class of 30 students?
17. Colors
Willie got birthday 6 colour pens in different colors. How many ways he can give them side by side in pencil?
18. Big factorial
How many zeros end number 116! ?
19. Football league
In the football league is 16 teams. How many different sequence of results may occur at the end of the competition?
20. Prize
How many ways can be rewarded 9 participants with the first, second and third prize in a sports competition?

Do you have an interesting mathematical example that you can't solve it? Enter it, and we can try to solve it.

To this e-mail address, we will reply solution; solved examples are also published here. Please enter e-mail correctly and check whether you don't have a full mailbox.