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How to solve this question related to arithmetic progression?
A biologist is growing a tissue culture in aPetri dish. Between the end of the second dayand the end of the fourth day, the culture’smass had increased by 4 milligrams.By the sixth day the culture had a massof 36 milligrams.Assuming that the daily growth isarithmetic, on what day will the culturemass first exceed 200 milligrams? Textbook's answer: 15 days I have tried solving the question, and the n value I get is 23 days. This is not a homework question, but rather a problem that I am not able to solve, mainly due to my lack of understanding.
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