$$\frac { n } { 2 }$$
$\frac{1}{2} = 0.5$
$$\frac{1}{2}n^{1-1}$$
$$\frac{1}{2}n^{0}$$
$$\frac{1}{2}\times 1$$
$$\frac{1}{2}$$
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$\frac{n}{2}$