Boys Vs Girls Challenge

The total number of ways in which 4 boys and 4 girls can form a line, with boys and girls alternating, is

Five boys and five girls form a line with the boys and girls alternating.Find the number of ways of making the line.

Boy and Girl standing in a queue

Six boys and six girls sit in a row randomly. Find the probability that (i) the six girls sit together,(ii) the boys and girls sit alternately.