Total number of ways = 9!*2!.
There are 12 person among whom 2 are brother. The total no.of ways in which these persons can be seated around a round table so that exactly 1 person sit between the brothers, is equal to?
a. 9!*2!
b. 7!*2!
c. 6!*1!
d. 2!*1!
e. 5!*1!