A box $$B_1$$ contains 1 white ball, 3 red balls and 2 black balls. Another box $$B_2$$, contains 2 white balls, 3 red balls and 4 black balls. A third box $$B_3$$ contains 3 white balls, 4 red balls and 5 black balls.
If 1 ball is drawn from each of the boxes $$B_1, B_2$$, and $$B_3$$, the probability that all 3 drawn balls are of the same colour is
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