1003024601
Level:
A
Assume the password for the safe deposit box consists of four different letters from the set
Combinatorics
1003024602
Level:
A
Suppose six pupils are sitting on six chairs in a row. Among them there are twins. In how many ways can the pupils be seated in the row so that the twins do not sit next to each other?
1003024606
Level:
A
Each payment card has its numeric four-digit PIN code. How many different PIN codes can be selected, if only a code with different numbers may be used?
1003024607
Level:
A
On the shelf, there should be three blue cups, three red cups, two yellow cups and two green cups arranged in a row from the left to the right. The cups of the same color are not mutually distinguishable. How many arrangements of these cups are possible?
1003024608
Level:
A
How many ways are there to arrange the letters in the Czech word KOMBINATORIKA?
1003024609
Level:
A
How many
1003024610
Level:
A
In a high-speed train set, there should be the following cars included:
1003024611
Level:
A
On a lock of a safe deposit box a ten-digit code can be set. The code can consist only of four
2000004501
Level:
A
How many ways are there to arrange the letters in the word DOG?
2000004502
Level:
A
Specify the number of all two-element subsets of the set