The Glider uses three parts of component A and two parts of component B, the Blimp uses two parts of components B and C, and the Pilot uses one part of each component.A sample of 75 components, 25 of each type, will be used to make prototypes for the various designs. The sample was analyzed and 20 of component A are proficient, 25 of component B were proficient and 15 of component C are proficient. If 30 components are selected at random, what is the likelihood two prototypes of each design can be made?
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i just want to ask how to construct the joint density function
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