Four Fours/17/Solutions/1

Puzzle: Four Fours: $17$

Using exactly $4$ instances of the number $4$, the task is to write an expression for $17$, using whatever arithmetical operations you consider necessary.

Solution

$17 = 4 \times 4 + \dfrac 4 4$

Sources

• 1926: Henry Ernest Dudeney: Modern Puzzles ... (previous) ... (next): Arithmetical and Algebraical Problems: Digital Puzzles: $58$. -- The Two Fours
• 1964: L.H. Clarke: Fun with Figures ... (previous) ... (next): Solutions: $(46)$
• 1968: Henry Ernest Dudeney: 536 Puzzles & Curious Problems ... (previous) ... (next): Arithmetical and Algebraical Problems: Digital Puzzles: $109$. The Two Fours
• 1980: Angela Dunn: Mathematical Bafflers (revised ed.) ... (previous) ... (next): $1$. Say it with Letters: Algebraic Amusements: Four Fours