$$\frac { 1 } { 18 } + \frac { 1 } { 18 } + \frac { 1 } { 18 } + \frac { 1 } { 18 }$$
$\frac{2}{9}\approx 0.222222222$
$$\frac{1+1}{18}+\frac{1}{18}+\frac{1}{18}$$
$$\frac{2}{18}+\frac{1}{18}+\frac{1}{18}$$
$$\frac{2+1}{18}+\frac{1}{18}$$
$$\frac{3}{18}+\frac{1}{18}$$
$$\frac{3+1}{18}$$
$$\frac{4}{18}$$
$$\frac{2}{9}$$
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$\frac{2}{3 ^ {2}} = 0.2222222222222222$
