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OpenStudy (anonymous):
Find s10 for -1+-7+-13+-19+...
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OpenStudy (welshfella):
the common difference is -6 S10 = (10/2)[2*-1 + (-6)(10-1)]
OpenStudy (welshfella):
the formula is Sn = (n/2)[2a1 + d(n-1)]
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