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According to the Department of Health and human Services, 30% of adolescents have some form of...

According to the Department of Health and human Services, 30% of adolescents have some form of mental illness.
a) What is the probability that two randomly selected adolescents have some form of mental illness? (simplify)

b) What is the probability that at least one of three randomly selected adolescents have some form of mental illness? (simplify)
Math   Statistics-And-Probability   
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