A box in a certain supply room contains five 40-W lightbulbs, three 60-W bulbs, and six 75-W bulbs. Suppose that three bulbs are randomly selected. (Round your answers to four decimal places.) What is the probability that exactly two of the selected bulbs are rated 75-W? What is the probability that all three of the selected bulbs have the same rating? What is the probability that one bulb of each type is selected?