## Video Links 12-1

**Videos:**

Counting Using Permutations (time: 10:29)

Permutations (time: 10:10)

… See the whole entry

**Videos:**

Counting Using Permutations (time: 10:29)

Permutations (time: 10:10)

… See the whole entry

Here is a comparison of permutations and combinations.

http://www.mathsisfun.com/combinatorics/combinations-permutations.html

**Problems 1-2**

These problems provide the main ideas for this section.

Be sure you know the formula for combinations.

**Problems 3-32**

Use the formula for permutations to answer these questions. See Examples 5, 6 and 9.

**Problems 33-42**

These are … See the whole entry

- Distinguish permutations and combinations
- License plate problem
- Which method?

**Fundamental Counting Principle
**If one task can be performed in

- Election problem
- tree diagram
- fundamental counting principle
- arrangement
- ordered pair/ordered triple
- define permutation
- notation for permutations
- evaluating permutations

- Factorial
- definition
- multiplication property of factorials
- count-down property
- permutation formula

- Distinguishable permutations
- indistinguishable items
- distinguishable items
- formula for distinguishable permutations