EXAMPLE 3 Computers in a shipment of 100 units contain a portable hard drive, solid-state memory, or both, according to the following table: Portable Hard Drive Solid-state memory Yes No Yes 15 80 No 4 1 Two computers are selected randomly, with replacement, from the the shipment. What is the probability mass function of the number of computers in the sample having both Portable Hard Drive and Solid-state memory?

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