ten family members: 5 grandchildren (3 brothers and 2 sisters) and their 5 grandparents are to be seated around a circular table. How many different seating arrangements are possible so that 2 sisters are seated between any two of the three brothers?	Answers:
A) 120  B) 480  C) 1440  D) 2880  E) 8640
Answer: 8640.
<result>E</result>
ten family members: 5 grandchildren (3 brothers and 2 sisters) and their 5 grandparents are to be seated around a circular table. How many different seating arrangements are possible so that 2 sisters are seated between any two of the three brothers?