Four Fours/9
Jump to navigation
Jump to search
Puzzle
Using exactly $4$ instances of the number $4$, the task is to write an expression for $9$, using whatever arithmetical operations you consider necessary.
Solutions
Solution $1$
- $9 = 4 + 4 + \dfrac 4 4$
Solution $2$
- $9 = \sqrt {\dfrac 4 {.\dot 4} } \times \sqrt {\dfrac 4 {.\dot 4} }$
Solution $3$
- $9 = \paren {\sqrt {\dfrac 4 {.\dot 4} } }^{\tfrac 4 {\sqrt 4} }$