Total number of members = 15
Here, the position of secretary, vice secretary and director are fixed but there is no condition of clockwise and anti clockwise.
Hence, total number of sitting ways according to condition = 2!
Now, we can change the position of 12 members only.
Hence, total number sitting ways of 12 members = 12!
Hence, total number of ways 15 member sit according to given condition = 12! × 2!