First box contains 4 red balls and 2 green balls and the second box contains 4 green and two red balls. By design, the probabilities of selecting box 1 or box 2 at random are 1/3 for box 1 and 2/3 for box 2.
A box is selected at random and a ball is selected at random from it.
Given that the ball selected is green, what is the probability it was selected from the second box?
1/5
1/3
1/4
1/2
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