(Answered) Eighth samples tested positive for arsenic

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Problem: Police suspect a person has been repeatedly poisoned with arsenic and have taken samples of the victim's hair. The hair sample was cut into 1.0-cm lengths, as shown below, and analyzed for arsenic. The first, fifth, and eighth samples tested positive for arsenic. Based on the fact that hair grows at a rate of 0.5 mm per day, determine the time intervals for which the victim was exposed to arsenic. Please explain your answer and also provide examples.

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