[12" persons are seated at a round table."],[" Number of ways of selecting "2" persons "],[" not adjacent to each other is "]

12persons are seated at a round table. Number of ways of selecting 2persons not adjacent to each other is

If n persons are sitting in a row, find the number of ways of selecting two persons, who are sitting adjacent to each other.

14 persons are seated at a round table. Find the number of ways of selecting two persons out of them who are not seated adjacent to each other.

Number of ways of seating 20 persons at two round tables. Seating 10 to each table is

10 persons are seated at round table then the number of ways of selecting 3 persons out of them if no two persons are adjacent to each other is

10 persons are sitting in a row. Find the number of ways of selecting two persons out of them who are sitting adjacent to each other