A family of seven members consists of a father, a mother and five children. They have to stand in a queue for check-in of their luggage at the airport. The father is concerned about the safety of his youngest child, Aaron. So, he wants to stand behind Aaron in the same queue. The mother insists on standing behind the father. In how many ways can the seven family members arrange themselves in a queue such that the concerns of both father and mother are addressed?
Why can I not do this as Assuming S,F,M as one group and rest all 4 as other groups . and say it is 5! ... Not multiplying by 3! since s,f,m has restrictions ... Why cant this be right here... since s,f,m are together in one way