Four Fours/4/Solutions/4

Puzzle: Four Fours: $4$

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

Solution

$4 = 4 + 4 - \sqrt 4 - \sqrt 4$

Sources

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