$$2 \times 1/9 \times 7 \times 1/9$$
$\frac{14}{81}\approx 0.172839506$
$$\frac{\frac{2}{9}\times 7\times 1}{9}$$
$$\frac{\frac{2\times 7}{9}\times 1}{9}$$
$$\frac{\frac{14}{9}\times 1}{9}$$
$$\frac{\frac{14}{9}}{9}$$
$$\frac{14}{9\times 9}$$
$$\frac{14}{81}$$
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$\frac{2 \cdot 7}{3 ^ {4}} = 0.1728395061728395$
