Q.

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?

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a

2 x 12!

b

24

c

2 x 15!

d

None of these

answer is A.

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Detailed 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 twospecified persons and the person can sit in two ways.
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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?