Four Fours/77

From ProofWiki
Jump to navigation Jump to search

Puzzle

Using exactly $4$ instances of the number $4$, the task is to write an expression for $77$, using whatever arithmetical operations you consider necessary.


Solutions

Solution $1$

$77 = \paren {\dfrac 4 {. \dot 4} }^{\sqrt 4} - 4$

Solution $2$

$77 = \dfrac {4! - . \dot 4} {.\dot 4} + 4!$


Also see

Previous  ... Next