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Mathematics
OpenStudy (anonymous):

question

OpenStudy (anonymous):

OpenStudy (unklerhaukus):

\[\sum^∞_{k=1}(-1)^{k+2}=(-1)^{1+2}+(-1)^{2+2}+(-1)^{3+2}+(-1)^{4+2}+...\]\[~~~~~~~~~~~~~~~~~~~~=(-1)^{3}+(-1)^{4}+(-1)^{5}+(-1)^{6}+...\]\[~~~~~~~~~~~~~~~~~~~~=(-1)+1+(-1)+1+...\]

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