Four Fours/55
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Puzzle
Using exactly $4$ instances of the number $4$, the task is to write an expression for $55$, using whatever arithmetical operations you consider necessary.
Solutions
Solution $1$
- $55 = \dfrac {4!} {. \dot 4} + \dfrac 4 4$
Solution $2$
- $55 = \dfrac {4! - .4} {.4} - 4$