Four Fours/66
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Puzzle
Using exactly $4$ instances of the number $4$, the task is to write an expression for $66$, using whatever arithmetical operations you consider necessary.
Solutions
Solution $1$
- $66 = \dfrac {4!} {.4} + \dfrac {4!} 4$
Solution $2$
- $66 = \dfrac {4!} {.4} + \dfrac 4 {\sqrt {. \dot 4} }$
Solution $3$
- $66 = 4 \times 4 \times 4 + \sqrt 4$
Solution $4$
- $66 = \dfrac {4!} {.4} + 4 + \sqrt 4$