$$\frac{ \frac{ 4 \times (1- \frac{ 1 }{ 1024 } ) }{ 1 } }{ 2 }$$
$\frac{1023}{512}=1.998046875$
$$\frac{4\left(1-\frac{1}{1024}\right)}{2}$$
$$\frac{4\left(\frac{1024}{1024}-\frac{1}{1024}\right)}{2}$$
$$\frac{4\times \frac{1024-1}{1024}}{2}$$
$$\frac{4\times \frac{1023}{1024}}{2}$$
$$\frac{\frac{4\times 1023}{1024}}{2}$$
$$\frac{\frac{4092}{1024}}{2}$$
$$\frac{\frac{1023}{256}}{2}$$
$$\frac{1023}{256\times 2}$$
$$\frac{1023}{512}$$
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$\frac{3 \cdot 11 \cdot 31}{2 ^ {9}} = 1\frac{511}{512} = 1.998046875$
