$$\frac{ 4 }{ 7 } \frac{ 4 }{ 7 } \frac{ 9 }{ 7 } /4$$
$\frac{36}{343}\approx 0.104956268$
$$\frac{\frac{4\times 4}{7\times 7}\times \frac{9}{7}}{4}$$
$$\frac{\frac{16}{49}\times \frac{9}{7}}{4}$$
$$\frac{\frac{16\times 9}{49\times 7}}{4}$$
$$\frac{\frac{144}{343}}{4}$$
$$\frac{144}{343\times 4}$$
$$\frac{144}{1372}$$
$$\frac{36}{343}$$
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$\frac{2 ^ {2} \cdot 3 ^ {2}}{7 ^ {3}} = 0.10495626822157435$
