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OpenStudy (anonymous):
summation, which is not equivalent to the others
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OpenStudy (anonymous):
\[\sum_{2}^{4}((-1)^k-1)/k-1\]
OpenStudy (anonymous):
\[\sum_{0}^{2}(-1)^k/k+1\]
OpenStudy (anonymous):
\[\sum_{-1}^{1}(-1)^k/k+2\]
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