One bag contains 4 white balls and 3 black balls, and a second bag contains 3 white balls and 5 black balls. | MATHalino

One bag contains 4 white balls and 3 black balls, and a second bag contains 3 white balls and 5 black balls. One ball is drawn at random from the second bag and is placed unseen in the first bag. What is the probability that a ball now drawn from the first bag is black?

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