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9-4 Permutations

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- How many different cell phone can we make?
- They come in black, silver, and blue.
- They can be touch screen or not.
- They can have a full keypad or just a number pad.

- An arrangement, or listing, of objects in which order is important
- Permutation… think: Position!
- Examples?

- Math, science, and Language arts.
- The classes cannot repeat.
- First: there are 3 possibilities for the first class, There are 2 choices that remain for the second class, and there is only one choice left for the last class, because the classes cannot repeat.
- So….. 3*2*1= 6 total possibilities for the 3 classes to be arranged.

- How many different class schedules can we make?
- Math, Science, SS, Language Arts, Reading
- What is the probability that they will be in the order I typed them?

- There are 30 people in a race. How many ways can 3 people come in 1st, 2nd, and 3rd?

- How may different 3 digit codes can we make if no digits can repeat?
- What is the probability that the code is to punch in 1, 2, and then 3?