$$12/25 \times 15/28 \times 35/36$$
$\frac{1}{4}=0.25$
$$\frac{\frac{\frac{12\times 15}{25}}{28}\times 35}{36}$$
$$\frac{\frac{\frac{180}{25}}{28}\times 35}{36}$$
$$\frac{\frac{\frac{36}{5}}{28}\times 35}{36}$$
$$\frac{\frac{36}{5\times 28}\times 35}{36}$$
$$\frac{\frac{36}{140}\times 35}{36}$$
$$\frac{\frac{9}{35}\times 35}{36}$$
$$\frac{9}{36}$$
$$\frac{1}{4}$$
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$\frac{1}{2 ^ {2}} = 0.25$
