A bag contains 4 red balls and 5 black balls


Asked by admin @ in Math viewed by 333 People


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

Answered by admin @



Let the two bags be A and B

A contains 4red 5 black balls

B contains 5 red and 3 black balls.

One ball is drawn from each bag. One must be red and one is black.
Red ball from A and black ball from B or black from A and red from B.

Probability =4/9*3/8+5/9*5/8=37/72.

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