Ashelf in the metro department store contains 90 colored ink cartridges for a popular ink-jet printer. five of the cartridges are defective. (a) if a customer selects 3 cartridges at random from the shelf, what is the probability that they are all defective? (round your answer to five decimal places.) (b) if a customer selects 3 cartridges at random from the shelf, what is the probability that at least 1 is defective? (round your answer to three decimal places.)