reno 911
' - ' kungfuloma, 11 2009.
108 ' ' taiie, 5 2012.
108 ' - ' chanoknon, 10 2007.
- 5 .68
' - ' FruitCake, 2 2007.
108 ' - ' goodjob2u, 30 2011.
ooozx0008, 27 2011 #8
( ) by Airthestar ' - ' , 23 2012.
' ' sam_sbcc, 4 2013.
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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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