Four Fours/Lemmata/Three Fours/7
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Puzzle
Using exactly $3$ instances of the number $4$, the task is to write an expression for $7$, using whatever arithmetical operations you consider necessary.
Solutions
Solution $1$
- $7 = \dfrac {4! + 4} 4$
Solution $2$
- $7 = 4 + \sqrt {\dfrac 4 {. \dot 4} }$