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Mathematics 20 Online
OpenStudy (anonymous):

need a little help finding function of a series :)

OpenStudy (anonymous):

The first five terms are, 2, -4, 6, -8, 10 for n=1 to n=5. So I've got \[an=\frac{ n+1 }{ n }\]

OpenStudy (anonymous):

which is close, but I need to make the terms to alternate positive and negative. How do I do that?

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