Combinatorial Flashcards
1
Q
Permutation with repetition
A
nr
- Example: Debit card PIN
2
Q
Permutation without repetition
A
n!
- Number of orders for the members of a sport team
3
Q
Permutation without repetition among r indistinguishable groups
A
- Number of arrangements of the letters PEPPER
4
Q
Permutation without repetition of a group of r among n
A
n! / (n - r)!
5
Q
Permutation
A
Order matters
6
Q
Combination
A
Order does not matter
7
Q
Combination without repetition
A
