$$\frac{ 3 }{ 4 } \times \frac{ 4 }{ 5 } \times \frac{ 6 }{ 7 } \times \frac{ 2 }{ 4 }$$
$\frac{9}{35}\approx 0.257142857$
$$\frac{3\times 4}{4\times 5}\times \frac{6}{7}\times \frac{2}{4}$$
$$\frac{3}{5}\times \frac{6}{7}\times \frac{2}{4}$$
$$\frac{3\times 6}{5\times 7}\times \frac{2}{4}$$
$$\frac{18}{35}\times \frac{2}{4}$$
$$\frac{18}{35}\times \frac{1}{2}$$
$$\frac{18\times 1}{35\times 2}$$
$$\frac{18}{70}$$
$$\frac{9}{35}$$
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$\frac{3 ^ {2}}{5 \cdot 7} = 0.2571428571428571$