A geologist has selected 9 specimens of basaltic rock and 10 specimens of granite rock. The geologist instructs her assistant to randomly choose 15 of these specimens for analysis.  (a) Determine the pmf for X = the number of granite specimens chosen (b) What is the probability that all specimens of one of the two types are selected for analysis?

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A: Total = 5 + 3 + 4 = 12

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