University of Virginia STAT STAT 1120 Some nomadic tribes, when faced with a life-threatening contagious…
Some nomadic tribes, when faced with a life-threatening contagious disease, try to improve their chances of survival by dispersing into smaller groups. Sup-pose a tribe of twenty-one people, of whom four are car-riers of the disease, split into three groups of seven each. What is the probability that at least one group is free of the disease? (Hint: Find the probability of the complement.)
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