Four Fours/79/Solutions/1

Puzzle: Four Fours: $79$

Using exactly $4$ instances of the number $4$, the task is to write an expression for $79$, using whatever arithmetical operations you consider necessary.

Solution

$79 = \paren {\dfrac 4 {. \dot 4} }^{\sqrt 4} - \sqrt 4$

Sources

• 1980: Angela Dunn: Mathematical Bafflers (revised ed.) ... (previous) ... (next): $1$. Say it with Letters: Algebraic Amusements: Four Fours