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A host invites 20 persons for a party. The number of ways they can be seated at a circular table, such that two particular persons be seated on either side of the host, is

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18!

19!

2.19!

2.18!

answer is B.

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Detailed Solution

The 18 guests excluding the two particular ones and the host sit in 18! Ways. The two particular guests sit on either side of the host in 2 ways. The desired number of ways is 2.18!

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