A bag contains eleven red marbles, seven blue marbles, nine green marbles, and thirteen yellow marbles. Which of the following statements is not true?

a.The theoretical probability of selecting a red marble from the bag is 27.5%.
b.The odds of selecting a yellow marble from the bag are 13 to 27.
c.The theoretical probability of selecting a blue or green marble from the bag is 2/3 .
d.The odds of selecting a red or blue marble are 9/11 .