Chapter 9.3, Problem 22MC

From a sack containing seven red marbles, eight blue marbles, and four white marble, marbles are drawn at random for several experiments. Determine the probability of each of the following events.

a. One marble drawn at random is either red or blue.

b. The first draw is red and the second is blue, where one marble is drawn at random, its color is recorded, the marble is replaced, and another marble is drawn.

c. The event in (b) where the first marble is not replaced.