In how many ways can 5 Indians and 5 Englishmen be seated along a circle so that they are alternate?
Choose one
A) 6!8!  B) 4!5!  C) 3!9!  D) 8!5!  E) 7!9!
5 Indians can be seated along a circle in 4! ways   Now there are 5 places for 5 Englishmen   5 Englishmen can be seated in 5! ways   Required number = 4!5!   Answer is 4!5!
<result>B</result>
In how many ways can 5 Indians and 5 Englishmen be seated along a circle so that they are alternate?