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The harmonic series is a divergent series in the form

\sum_{n=1}^\infty\dfrac{1}{n}=1+\frac12+\frac13+\frac14+\cdots

It is often useful to use in comparison tests, since similar series appear fairly often. A related series is the alternating harmonic series, which takes the form

\sum_{n=1}^\infty\dfrac{(-1)^{n-1}}{n}=1-\frac12+\frac13-\frac14+\cdots

Unlike the harmonic series, the alternating harmonic series is convergent and converges to \ln(2) .

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