In how many ways can 9 persons sit around a table so that all shall not have the same neighbours in any two arrangements?

Asked by Topperlearning User | 4th Jun, 2014, 01:23: PM

Expert Answer:

Persons can sit at a round table in  ways. But in clockwise and anti-clockwise arrangement, every person will have the same neighbours.
So, the required numbers of ways are

Answered by  | 4th Jun, 2014, 03:23: PM