A bag contains 4 red balls and 5 black balls
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A bag contains 4 red and 5 black balls. Another bag contains 5 red, 3 black balls. If one ball is drawn at random from each bag. Then the probability that one red and one black ball drawn is _______.
(a) 12/72 (b) 25/72 (c) 37/72 (d) 13/72