Four Fours/Lemmata/Three Fours/90/Solutions/1
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Puzzle: Three Fours: $90$
Using exactly $3$ instances of the number $4$, the task is to write an expression for $90$, using whatever arithmetical operations you consider necessary.
Solution
- $90 = \dfrac {4!} {.4 \times \sqrt {. \dot 4} }$