$$C \frac { 5 } { 7 }$$
$\frac{5}{7} = 0.7142857142857143$
$$\frac{5}{7}C^{1-1}$$
$$\frac{5}{7}C^{0}$$
$$\frac{5}{7}\times 1$$
$$\frac{5}{7}$$
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$\frac{5C}{7}$