Use Bayes Theorem to solve this problem, A paper bag contains two red balls and one blue ball. A plastic bag

contains three blue balls and one red ball. A coin is tossed. If it falls heads up, the paper bag is selected and a

ball is drawn. If the coin falls tails up, the plastic bag is selected and a ball is drawn. If a red ball is selected,

what is the probability that it came from the paper bag?

A) 8/11

B) 1/3

C) 1/8

D) 3/8