Evaluate $\{(999) 2-1\}$
$\left\{(999)^{2}-1\right\}=\left\{(999)^{2}-1^{2}\right\}$
$=(999-1)(999+1)$
$=(998)(1000)$
$=998000$
Hence, $\left\{(999)^{2}-1\right\}=998000$.
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