Discussion Problem_(19)

Posted by duck on May 29, 2013; 12:04am
URL: http://discussion-forum.276.s1.nabble.com/Discussion-Problem-19-tp7581421.html

1) Suppose, there are 20 people among whom are 2 brothers. Find the number of ways in which these people can be arranged in a CIRCLE such that there is exactly on person between the two brother.