Question 3Suppose $[a\ b]$ denotes the average of $a$ and $b,$ and $\{a\ b\ c\}$ denotes the average of $a,$ $b,$ and $c.$ What is the value of the following expression? $$ \{\{1 \ 1 \ 0\} \ [0 \ 1] \ 0\} $$$\dfrac{2}{9}$$\dfrac{5}{18}$$\dfrac{1}{3}$$\dfrac{7}{18}$$\dfrac{2}{3}$