Question

The number of ways in which 7 boys sitting near round table so that the two particular boys may not sit together is

Answer 1

Answer:

The number of ways of 7 boys sitting around round table is ,(n-1)!=6! =720

The number of ways of two particular boys sit together is 5!2!=240

The number of ways of two perticular persons may not sit together is 720-240=480