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OpenStudy (anonymous):
ind the sum of the first 50 terms of the arithmetic sequence -15,-9,-3,3....
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OpenStudy (anonymous):
-15,-9,-3,3,6,and 9 cancel out, so we have 44 terms lft starting with 21. the sum of these is 21(44)+6+12 and so on, which would give us 21(44)+6(1+2+3...43)=21*44+6(43*22) which equlas 6600
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