$$(2/3)(2/3)(2/3)$$
$\frac{8}{27}\approx 0.296296296$
$$\frac{2\times 2}{3\times 3}\times \frac{2}{3}$$
$$\frac{4}{9}\times \frac{2}{3}$$
$$\frac{4\times 2}{9\times 3}$$
$$\frac{8}{27}$$
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$\frac{2 ^ {3}}{3 ^ {3}} = 0.2962962962962963$