Sufficiently Distinct?
Logic
Level
1
\[ \LARGE{ \require{enclose} \begin{array}{rll} \phantom{0}\ \boxed{\phantom{0}} && \\[-2pt] \boxed{{9}}\ \enclose{longdiv}{\boxed{\phantom{0}} \ \boxed{8}}\kern-.2ex \\[-2pt] \underline{\boxed{\phantom{0}} \ \boxed{7}} && \\[-2pt] \boxed{\phantom{0}} \end{array} } \]
The above shows an incomplete long division. Which of the following digits was not used in this division?
by
Pi Han Goh