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6. A mosquito trap yields 28 mosquitoes of which 10 have the West Nile Virus (WNv) and 18 do not have the West Nile Virus. If three of the 28 mosquitoes are chosen at random, what is the following probabilities: (a) that none of the three have WNV? (b) that two of the three have WNV? (c) that at least one of these three will have the West Nile Virus?
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