A bag contains 3 red and 3 green balls a...

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 draws out 3 at random. The chance that the 3 later balls being all of different colors is a.`15 %` b. `20 %` c. `27 %` d. `40 %`

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