Four Fours/15

Puzzle

Using exactly $4$ instances of the number $4$, the task is to write an expression for $15$, using whatever arithmetical operations you consider necessary.

Solutions

Solution $1$

$15 = 4 \times 4 - \dfrac 4 4$

Solution $2$

$15 = \dfrac {44} 4 + 4$

Solution $3$

$15 = \dfrac {4! + 4 + \sqrt 4} {\sqrt 4}$

Also see

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