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Find the sequence of the numbers defined...

Find the sequence of the numbers defined by
`a_(n)={{:(1/n,"when n is odd"),(-1/n,"when n is even"):}`

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To find the sequence defined by \( a_n \) where: \[ a_n = \begin{cases} \frac{1}{n} & \text{when } n \text{ is odd} \\ -\frac{1}{n} & \text{when } n \text{ is even} \end{cases} ...
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