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according to the American lung association, 90% of adult smokers started smoking before turning 21 years old. Ten smokers 21 years old or older are

according to the American lung association, 90% of adult smokers started smoking before turning 21 years old. Ten smokers 21 years old or older are randomly selected, and the number of smokers who started smoking before 21 is recorded.

Find the probability that exactly 3 of them started smoking before 21 years of age

Find the probability that at least 3 of them started smoking before 21 years of age

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