47. Use technology (see Spotlight 8.3, page 369) for this exercise. A university IT department receives a shipment of 30 printers—20 are inkjet printers and 10 are laser printers. A particular technician randomly chooses 7 of the printers to process (check that it works, tag the printer, etc.). What is the probability that exactly 4 of the printers are inkjets and 3 are laser printers (we’ll call this event )?