1. I have a bag of marbles with 5 yellow marbles, 11 red marbles and 7 brown marbles. Two marbles are drawn at random. First, draw the tree diagram and then compute the following probabilities - give your answers in fractions, in lowest terms.

With the aid of the probability tree, find the probability of:

a. Choosing 2 red marbles.

b. Choosing two marbles of the same color.

c. Choosing different colored marbles.