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

Question: 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 from the first bag and placed unseen in the second bag. What is the
probability that a ball now drawn from the second bag is black?

#Probability
#Statistics
#Technique
#Formula