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OpenStudy (anonymous):
Arithmetic sequence question... Find the sum of the series: a.1+2+3+........+1000 b.19+17+15+..+(-21)
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OpenStudy (joannablackwelder):
To find the sum of a certain number of terms of an arithmetic sequence:|dw:1406158852828:dw| where Sn is the sum of n terms (nth partial sum), a1 is the first term, an is the nth term.
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