# Circular Permutations

The circular permutations are used when the elements have to be arranged "in a circle" order, (for example, the guests around a table at a dinner party), so that the first element that "is located" in the sample determines the beginning and the end of the sample.

#### Examples

1. Calculate the circular permutations of 7 elements.

PC_{7}= (7 − 1)! = 6! = 6** · ** 5** · ** 4** · ** 3** · ** 2** · ** 1 = 720

2. How many ways can eight people sit around a round table?

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