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\frac{1}{2} - \frac{1}{2} + \frac{1}{2} - \frac{1}{2} + . . . . .

(n \in N, n > 1)

\frac{(- 1)^{n}}{n + 1}

\frac{(- 1)^{n - 1}}{n + 1}

\frac{(- 1)^{n + 1}}{n + 1}

\frac{(- 1)^{- n - 1}}{n + 1}

ANS : 3

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