The number of ways 10 persons be seated in a row so that no two of the three particular persons are never together.

In how many ways 5 persons can be seated in a row ?

Number of ways in which 6 persons can be seated around a circular table so that two particular persons are never seated together , is equal to :

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 different ways in which 8 persons can stand in a row so that between two particular person A and B there are always two person, is

Find the number of ways in which 5 boys and 5 girls be seated in a row so that all the girls are never together

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

Find the number of ways in which 7 persons can be arranged at a round table, if two particular persons may not sit together.

12 persons are seated around a round table. What is the probability that two particular persons sit together?