Find the number of ways of selecting 9 balls from 6 red balls, 5 white balls and 5 blue balls if each selection consists of 3 balls of each colour.

Explanation

Total number of ways

`=>6_(C_3)**5_(C_3)**5_(C_3)`

`=>(6!)/(3!**3!)**(5!)/(3!**2!)**(5!)/(3!***2!)`

`=>20**10**10`

`=>2000`