Four Fours/28/Solutions/2

Puzzle: Four Fours: $28$

Using exactly $4$ instances of the number $4$, the task is to write an expression for $28$, using whatever arithmetical operations you consider necessary.

Solution

$28 = \dfrac {4! \times 4} 4 + 4$

Sources

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