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20 persons were invited to a party. In how many ways, they and the host can be seated at a circular table?

18 !
19 !
20 !
Couldn't be determined

Correct Answer: 20 !

Explanation:

Total persons on the circular table
= 20 guests + 1 host = 21
They can be seated in (21 - 1) ! = 20 ! ways .

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