Re: Genetics prob from book that I cant get (probability type)
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I don't know anything about biology, but I'm pretty sure it's .25.
For every 6 50 year-olds, 3 have nothing, 1 has disease+nosymptoms, 2 have disease+symptoms. You know he's not in the last category, so it's 3-1 against having it, right?
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This was my answer
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