First slide
Permutations
Question

In how many ways can 15 members of a council sit along a circular table, when the Secretary is to sit on one side of the Chairman and the Deputy Secretary on the other side?

Moderate
Solution

Since, total members are 15 but three special members constitute one member.
therefore, required number of arrangements are 12 ! x 2 , because, chairman remains between the two
specified persons and the person can sit in two ways. 

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