The number of ways in which 20 girls be seated round a table if there are only 10 chairs

In how many ways can 20 persons be seated round a table if there are 9 chairs?

In how many ways can 20 persons be seated round a table if there are 9 chairs.

Number of ways 15 persons be seated round a table if there are 7 seats, is

The number of ways in which 7 persons can be seated at a round table if twom particular persons are not to sit together is

The number of ways in which 5 boys and 3 girls can be seated on a round table if a particular boy B_(1) and a particular girl G_(1) never sit adjacent to each other is

The number of ways in which 8 boys be seated at a round table so that two particular boys are next to each other is