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But in high-level problems, sometimes the answer is approximate, but not for olympiad.
Lets assume the sum is 210, a = 5, d = 3, and solve:
But perhaps the problem meant the sum is 185 for n=10?
The sum of the first n terms of an arithmetic sequence is 340. First term is 5, common difference 3. Find n.
The sum of the first n terms of an arithmetic sequence with first term 4 and common difference 3 is 100. Find n.
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