$$1-\frac{1}{4}+\frac{1}{8}$$
$\frac{7}{8}=0.875$
$$\frac{4}{4}-\frac{1}{4}+\frac{1}{8}$$
$$\frac{4-1}{4}+\frac{1}{8}$$
$$\frac{3}{4}+\frac{1}{8}$$
$$\frac{6}{8}+\frac{1}{8}$$
$$\frac{6+1}{8}$$
$$\frac{7}{8}$$
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$\frac{7}{2 ^ {3}} = 0.875$