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Question: A patient is injected with a drug


A patient is injected with a drug every 12 hours. Immediately before each injection the concentration of the drug has been reduced by 90% and the new dose increases the concentration by 1.5 mg/L.
(a) What is the concentration after three doses?
(b) If Cn is the concentration after the nth dose, find a formula for Cn as a function of n.
(c) What is the limiting value of the concentration?

1.99

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