There are 20 people among whom two are sisters.
Find the number of ways in which we can arrange
them around a circle so that there is exactly one
person between the two sisters?

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Think of 20 slots laid out like this
|dw:1442808790743:dw|
I can't fit all 20, but you get the idea

the first and third slots are locked up by the 2 sisters
|dw:1442808843579:dw|

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