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13. Suppose that in exercise 11, the first marble selected is not replaced before the second marble is chosen. Determine the probabilities of the events in 11a, b, and c. The Question 11 was A box contains 7 black, 3 red, and 5 purple marbles. Consider the two-stage experiment of randomly selecting a marble from the box, replacing it, and then selecting a second marble. Determine the probabilities of the events in exercises 11 and 12. R R P P P B B B B B B B P R P 11. a. Selecting 2 red marbles. b. Selecting 1 red then 1 black marble. c. Selecting 1 red then 1 purple marble.