Permutations and Combinations Flashcards
1
Q
nPr = ?
A
(n-r)!
2
Q
nCr = ?
A
(n-r)! r!
3
Q
What is the relationship between nPr and nCr?
A
nPr / r! = nCr
4
Q
How many ways can you arrange the letters in the word POTATO?
A
6!
——— = 180
2! x 2!
5
Q
How many ways can the letters in the word PARRAMATTA be arranged?
A
4! x 2! x 2!
6
Q
How many ways can six people be seated around a circular table?
A
6!
—— = 5!
6
7
Q
What is the difference between permutation and combinations?
A
In Permutations or is imPortant.
