$$\frac{1}{2}\times\frac{2}{3}\times\frac{3}{4}$$
$\frac{1}{4}=0.25$
$$\frac{1\times 2}{2\times 3}\times \frac{3}{4}$$
$$\frac{1}{3}\times \frac{3}{4}$$
$$\frac{1\times 3}{3\times 4}$$
$$\frac{1}{4}$$
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$\frac{1}{2 ^ {2}} = 0.25$
