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Mathematics 10 Online
OpenStudy (anonymous):

A researcher wants to conduct a genetic study using 10 randomly-selected volunteers. He has a volunteer pool of 20, composed of 10 males and 10 females. What is the probability that the randomly-selected group will be all male OR all female? A. 1/184,756 B. 1/92,378 C. 5/138,567 D. 1/138,567

OpenStudy (anonymous):

all male \[\frac{1}{\binom{20}{10}}\] same for all female so answer is \[\frac{2}{\binom{20}{10}}\]

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