$$\frac{ 4 }{ 7 } \frac{ 4 }{ 7 } \frac{ 9 }{ 7 } /7$$
$\frac{144}{2401}\approx 0.05997501$
$$\frac{\frac{4\times 4}{7\times 7}\times \frac{9}{7}}{7}$$
$$\frac{\frac{16}{49}\times \frac{9}{7}}{7}$$
$$\frac{\frac{16\times 9}{49\times 7}}{7}$$
$$\frac{\frac{144}{343}}{7}$$
$$\frac{144}{343\times 7}$$
$$\frac{144}{2401}$$
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$\frac{2 ^ {4} \cdot 3 ^ {2}}{7 ^ {4}} = 0.059975010412328195$
