Four Fours/12/Solutions/3

Puzzle: Four Fours: $12$

Using exactly $4$ instances of the number $4$, the task is to write an expression for $12$, using whatever arithmetical operations you consider necessary.

Solution

$12 = \dfrac {4! \times 4} {4 \times \sqrt 4}$

Sources

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