Permutations

A permutation is an arrangement of objects in a specific order. It is used when the order of selection matters.

Permutation Formula

Example: Permutation

Special Cases

Permutations with Repetition

Example: Permutations with Repetition

Permutations of Identical Objects

Example: Identical Objects

Circular Permutations

Practice Problems

1. Find .
2. How many 4-letter words can be formed from the letters of COMPUTER (no repetition)?
3. Find the number of arrangements of the letters in BOOKKEEPER.
4. In how many ways can 5 people sit around a circular table?