Answer
$0$
Work Step by Step
$\lim_{n \to \infty} a_n = \lim_{n \to \infty}\frac{n-1}{n^2}=\lim_{n \to \infty}\frac{n}{n^2}-\frac{1}{n^2}=\lim_{n \to \infty}\frac{1}{n}-\frac{1}{n^2}=0-0=0$
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