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A geologist has collected 24 specimens of basaltic rock and 15 specimens of granite. The geologist...

A geologist has collected 24 specimens of basaltic rock and 15 specimens of granite. The geologist instructs a laboratory assistant to randomly select 10 of the specimens for analysis.
(a) What is the probability that at least 3 of the selected specimens are granite?
(b) If this same process is repeated every day, what is the probability that it will take exactly 3 days in order to get a sample in which at least 3 of the specimens are granite?
Math   Statistics-And-Probability   
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