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Probability of males being colorblind

Dear OTA,

Please help me with the following question.

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About 8% of males are colorblind. A researcher needs some colorblind subjects for an experiment, and begins checking potential subjects.

A). what's the probability that she won't find anyone colorblind among the first 4 men she checks?

B). what's the probability that the first colorblind man found will be the sixth person checked?

C). What's the probability that she finds someone who is colorblind before checking the 10th man?
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Thanks

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