$$\frac { 2 } { 3 } \times \frac { 9 } { 11 } \times \frac { 12 } { 13 } \times \frac { 26 } { 63 }$$
$\frac{16}{77}\approx 0.207792208$
$$\frac{2\times 9}{3\times 11}\times \frac{12}{13}\times \frac{26}{63}$$
$$\frac{18}{33}\times \frac{12}{13}\times \frac{26}{63}$$
$$\frac{6}{11}\times \frac{12}{13}\times \frac{26}{63}$$
$$\frac{6\times 12}{11\times 13}\times \frac{26}{63}$$
$$\frac{72}{143}\times \frac{26}{63}$$
$$\frac{72\times 26}{143\times 63}$$
$$\frac{1872}{9009}$$
$$\frac{16}{77}$$
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$\frac{2 ^ {4}}{7 \cdot 11} = 0.2077922077922078$
