Five children — A, B, C, D and E — are going to sit in five chairs in a row. The children C & E have to sit next to each other, and the others can sit in any order in any remaining chairs. How many possible configurations are there for the children? Choose the correct option: A) 60 B) 20 C) 40 D) 43 E) 48
for such questions , we can treat both as one then total person=4..   these 4 can be arranged in 4! ways.. but within these 4 , one consists of two people who can be arranged in 2 ways CE or EC.. so ans =4!*2=48   ans 48
<result>E</result>
Five children — A, B, C, D and E — are going to sit in five chairs in a row. The children C & E have to sit next to each other, and the others can sit in any order in any remaining chairs. How many possible configurations are there for the children?