Blood donation probability (Will rate LS!)

Of the volunteers donating blood in a clinic, 80% have the Rhesues (Rh) factor present
in their blood. If ?ve volunteers are randomly selected, what is the probability that at least one does not have the Rh factor? Also, what is the probability that atmost four have the Rh factor? Finally, what is the smallest number of volunteers needed to be selected if we want to be at least 90% certain that we obtain at least?ve donors with the Rh factor?


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