Question: Draw 4 balls randomly from a box containing 3 red ball, 3 blue ball, 3 yellow balls and 3 green balls. All are identical.

Draw 4 balls randomly from a box containing 3 red ball, 3 blue ball, 3 yellow balls and 3 green balls. All are identical. What is the probability that 2 of the drawn balls are of one colour and the remaining 2 are of another colour.

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