There are natural numbers between n2 and (n + l)2
$2 n$
Natural numbers between $n^{2}$ and $(n+1)^{2}=\left[(n+1)^{2}-n^{2}\right]-1$
$=\left[n^{2}+2 n+1-n^{2}\right]-1$
$=2 n+1-1=2 n$
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