(Answered) Question blood only 4 of people have type ab blooda on

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Question: Blood. Only 4% of people have Type AB blood.

a) On average, how many donors must be checked to find someone with Type AB blood?

b) What's the probability that there is a Type AB donor among the first 5 people checked?

c) What's the probability that the first Type AB donor will be found among the first 6 people?

d) What's the probability that we won't find a Type AB donor before the 10th person?

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