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

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.

12persons are seated at a round table. Number of ways of selecting 2persons not 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

20 persons are sitting in a particular arrangement around a circular table. Three persons are to be selected for leaders. The number of ways of selection of three persons such that no two were sitting adjacent to each other is a. 600 b. 900 c. 800 d. none of these

20 persons are sitting in a particular arrangement around a circular table.Three persons are to be selected for leaders.The number of ways of selection of three persons such that no two were sitting adjacent to each other is a.600 b.900 c.800 d.none of these

20 persons are sitting in a particular arrangement around a circular table. Three persons are to be selected for leaders. The number of ways of selection of three persons such that no two were sitting adjacent to each other is a. 600 b. 900 c. 800 d. none of these

Ten persons are arranged in a row . The number of ways of selecting four persons so that no two persons sitting next to each other's are selected is