$$20 \% n 2$$
$\frac{1}{5} = 0.2$
$$\frac{1}{5}n_{2}^{1-1}$$
$$\frac{1}{5}n_{2}^{0}$$
$$\frac{1}{5}\times 1$$
$$\frac{1}{5}$$
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$\frac{n_{2}}{5}$
$$\frac{1}{5}n_{2}$$