How many different ways can 9 people line up for a picture?

1 Answer
EZ as pi
Jun 15, 2016

9! = 9x8x7x6x5x4x3x2x1

Explanation:

Think about this one person at a time.
For the first position there will be 9 people to choose from.
Once that person is chosen, there are 8 to choose from for the second person and so on, until for the last person there will only be 1 person left for the last position.

This is called 9 factorial (9!) and means 9x8x7x6x5x4x3x2x1.

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