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Can you assemble a formula using the least number of one digit numbers (from $0$ to $9$) so that the results equals to 2018 with the rules below?
You may use the operations $x + y$, $x - y$, $x \times y$, $x \div y$, $x!$, $\sqrt[\leftroot{-2}\uproot{2}x]{y}$ and $x^y$,
Using a direct squa...