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If you imagine there are 10 spots on the floor in a line where people can stand, then the first person has 10 choices of where to stand.

The second person has 9 choices since the first person is already on one of the spots.

The third person has 8 choices. And so on until the last person has no choice.

We can now mulitply the numbers together. 10x9x8x7x6x5x4x3x2x1. This is called a factorial (where you multiply all of the consecutive numbers together from 1) and it is written as 10!.

This means there are 3,628,800 ways of arranging the 10 people

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15y ago

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