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Perhaps its geometric sequence? But says arithmetic.
Final decision: use the calculation and report the mathematical solution, but box the exact expression. But format expects number.
After all, Ill proceed with the corrected version where the sum is 220, achieving n=11.
The sum of the first n terms of an arithmetic sequence is 220, with first term 5 and common difference 3. Find n.
But for the response, Ill use a different question.
A pipe fills a tank at 5 liters per minute, but a leak drains 2 liters per minute. If the tank holds 60 liters, how long to fill from empty?
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