# Desks

A class has 20 students. The classroom consists of 20 desks, with 4 desks in each of 5 different rows. Amy, Bob, Chloe, and David are all friends, and would like to sit in the same row. How many possible seating arrangements are there such that Amy, Bob, Chloe, and David are all in the same row?

Result

n =  120

#### Solution:

$n=5 \cdot \ 4!=120$

Our examples were largely sent or created by pupils and students themselves. Therefore, we would be pleased if you could send us any errors you found, spelling mistakes, or rephasing the example. Thank you!

Leave us a comment of this math problem and its solution (i.e. if it is still somewhat unclear...):

Be the first to comment!

Tips to related online calculators
Would you like to compute count of combinations?

## Next similar math problems:

1. Variations
Determine the number of items when the count of variations of fourth class without repeating is 42 times larger than the count of variations of third class without repetition.
2. Trainings
The table contains tennis training schedule for Saturday's younger students during the winter indoor season. Before the start of the summer season is preparing a new training schedule. Tomas Kucera will be able to practice only in the morning, sisters Kov
3. Chess
How many ways can select 4 fields on classic chess board with 64 fields, so that fields don't has the same color?
Determine the number of integers from 1 to 106 with ending four digits 2006.
5. Toys
3 children pulled 12 different toys from a box. Many ways can be divided toys so that each children had at least one toy?
6. Numbers
How many different 3 digit natural numbers in which no digit is repeated, can be composed from digits 0,1,2?
7. Theorem prove
We want to prove the sentence: If the natural number n is divisible by six, then n is divisible by three. From what assumption we started?
8. Tokens
In the non-transparent bags are red, white, yellow, blue tokens. We 3times pull one tokens and again returned it, write down all possibilities.
9. 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.
10. Olympics metals
In how many ways can be win six athletes medal positions in the Olympics? Metal color matters.
11. Possible combinations - word
How many ways can the letters F, A, I, R be arranged?
12. Tricolors
From the colors - red, blue, green, black and white, create all possible tricolors.
13. Election 4
In a certain election there are 3 candidates for president 5 for secretory and 2 for tresurer. Find how many ways the election may (turn out/held).
14. Metals
In the Hockey World Cup play eight teams, determine how many ways can they win gold, silver and bronze medals.
15. PIN - codes
How many five-digit PIN - code can we create using the even numbers?
16. Five letters
How many ways can five letters be arranged?