$$\frac{ 5 }{ 7 } \frac{ 3 }{ 7 } \frac{ 7 }{ 9 } \frac{ 5 }{ 11 }$$
$\frac{25}{231}\approx 0.108225108$
$$\frac{5\times 3}{7\times 7}\times \frac{7}{9}\times \frac{5}{11}$$
$$\frac{15}{49}\times \frac{7}{9}\times \frac{5}{11}$$
$$\frac{15\times 7}{49\times 9}\times \frac{5}{11}$$
$$\frac{105}{441}\times \frac{5}{11}$$
$$\frac{5}{21}\times \frac{5}{11}$$
$$\frac{5\times 5}{21\times 11}$$
$$\frac{25}{231}$$
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$\frac{5 ^ {2}}{3 \cdot 7 \cdot 11} = 0.10822510822510822$
