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OpenStudy (anonymous):
Write the series in summation notation: -2 + 4 - 6 + 8 - 10 + 12
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OpenStudy (amistre64):
alternating even numbers ... seems simple enough
OpenStudy (amistre64):
(-1)^n alternates signs ... and an even number is of the form 2n ... sum them up from n=1 to n=6
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