Re: probability question
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The question is ambiguous. MickeyHoldem pointed to an explanation if there is an infinite population of people. In that case the answer is 3*0.4*0.6^2 = 42.3%. You answered it assuming the population is 10 people in which case the answer is 50%.
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Actually it's worse than that - there isn't sufficient information since the population that donates blood is self-selected.
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