Four Fours/70/Solutions/1

Puzzle: Four Fours: $70$

Using exactly $4$ instances of the number $4$, the task is to write an expression for $70$, using whatever arithmetical operations you consider necessary.

Solution

$70 = \dfrac {4!} {.4} + \dfrac 4 {.4}$

Sources

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