Four Fours/84/Solutions
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Puzzle: Four Fours: $84$
Using exactly $4$ instances of the number $4$, the task is to write an expression for $84$, using whatever arithmetical operations you consider necessary.
Solutions
Solution $1$
- $84 = \paren {4! + 4} \times \sqrt {\dfrac 4 {. \dot 4} }$
Solution $2$
- $84 = \dfrac {4! + 4! \times .4} {.4}$
Solution $3$
- $84 = \sqrt 4 \times 44 - 4$