Bag a contains 5 white and 4 black balls and bag b contains 7 white and 6 black balls. One bag is drawn from the bag a and without noticing its colour, is put in the bag b. If a ball is drawn from bag b, find the probability that it is black in colour.
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Step-by-step explanation:
Total ball bag a and b = 22
Total black ball bag a and b = 10
P(of black ball) = 10/22=5/11
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