Lectures - 3.4 Bayes Probabilities

Urn A has 2 red balls and 1 green ball.
Urn B has 3 red balls and 3 green balls.
One urn is randomly selected, and a ball is randomly drawn from that urn.
What’s the probability that urn A was selected, given a green ball was drawn?

• A. 1/5
• B. 2/5
• C. 1/2