document.write( "Question 604057: Will you show me how to evaluate this problem. 2+5+8+11+.....; S9 I know it is an Arithmatic series, I just don't know how to evaluate it! \n" ); document.write( "
Algebra.Com's Answer #380950 by jim_thompson5910(35256)\"\" \"About 
You can put this solution on YOUR website!
Hint: For any general arithmetic sequence, it's nth partial sum is \"S%5Bn%5D=%28n%2A%28a%5B1%5D%2Ba%5Bn%5D%29%29%2F2\" \n" ); document.write( "
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