Four Fours/71/Solutions/1

Puzzle: Four Fours: $71$

Using exactly $4$ instances of the number $4$, the task is to write an expression for $71$, using whatever arithmetical operations you consider necessary.

Solution

$71 = \dfrac {4! + 4 + .4} {.4}$

Sources

• 1964: L.H. Clarke: Fun with Figures ... (previous) ... (next): Solutions: $(46)$
• 1980: Angela Dunn: Mathematical Bafflers (revised ed.) ... (previous) ... (next): $1$. Say it with Letters: Algebraic Amusements: Four Fours