Probability 3 Question 32

32. Urn A contains 6 red and 4 black balls and urn B contains 4 red and 6 black balls. One ball is drawn at random from urn A and placed in urn B. Then, one ball is drawn at random from urn B and placed in urn A. If one ball is drawn at random from urn A, the probability that it is found to be red, is….

(1988, 2M)

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Solution:

  1. Let R be drawing a red ball and B for drawing a black ball, then required probability

=RRR+RBR+BRR+BBR=610×511×610+610×611×510+410×411×710+410×711×610=6401100=3255



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