Urn A has 5 red and 7 green balls. Urn B has 3 red and 12 green balls. We ip a fair coin. If the outcome is heads, then a ball from Urn A is selected, whereas if the outcome is tails, then a ball from Um B is selected. Suppose that after running this experiment, we get a red ball. What is the probability that the coin landed tails, given that this is our nal outcome? That is, let R be the event we get a red ball, and T be the event the coin landed tails. What is PlTlR)