If 11 members of a committee sit at a round table so that the president and secretary always sit together, then the number of arrangements, is

Find the number of arrangement if 11 members of a committee at a round table so that the president and secretary always sit together.

In how many ways can 11 members of a committee sit at a round table so that the secretary and the joint secretary are always the neighbours of he president?

In how many ways can 12 members be seated at a round table when the secretary and the joint secretary are always the neighbours of the president.

12 members of a committee are to sit down at random round a table. Probability that there are 3 members between the two particular members A and B, is