A bag contains 3 red and 3 green balls and a person draws out 3 at random. He then drops 3 blue balls into the bag and again out 3 at random. The chance that the 3 later balls being all of different colors is

Question : A bag contains 3 red and 3 green balls and a person draws out 3 at random. He then drops 3 blue balls into the bag and again out 3 at random. The chance that the 3 later balls being all of different colors is