Four Fours/86/Solutions/1
< Four Fours | 86 | Solutions
Jump to navigation
Jump to search
Puzzle: Four Fours: $86$
Using exactly $4$ instances of the number $4$, the task is to write an expression for $86$, using whatever arithmetical operations you consider necessary.
Solution
- $86 = 4! \times 4 - \dfrac 4 {.4}$
Sources
- 1980: Angela Dunn: Mathematical Bafflers (revised ed.) ... (previous) ... (next): $1$. Say it with Letters: Algebraic Amusements: Four Fours