Four Fours/39/Solutions/3

Puzzle: Four Fours: $39$

Using exactly $4$ instances of the number $4$, the task is to write an expression for $39$, using whatever arithmetical operations you consider necessary.

Solution

$39 = 4! \times \sqrt 4 - \dfrac 4 {. \dot 4}$

Sources

• 1964: L.H. Clarke: Fun with Figures ... (previous) ... (next): Solutions: $(46)$