A box contains 5 black and 7 white balls while the other one contains 4 black and 2 white balls. A ball is selected randomly from one of the boxes is turns out to be black. What is the probability that it come from the second box?
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total no. of balls = 9 black and 9 white
p(b) = favourable outcome / total outcome
then,
total balls = 18
no of black ones =9
p = 9/18
hence probability for getting black ball is 1/2
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