If \( \lim _{n \rightarrow \infty}\left(\sqrt{n^{2}-n-1}+n \alpha+\beta\right)=0 \), then \( 8(\...

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If \( \lim _{n \rightarrow \infty}\left(\sqrt{n^{2}-n-1}+n \alpha+\beta\right)=0 \), then \( 8(\alpha+\beta) \) is equal to
(a) 4
(b) -8
(c) -4
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