Henry Ernest Dudeney/Puzzles and Curious Problems/214 - Colouring the Map
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Puzzles and Curious Problems by Henry Ernest Dudeney: $214$
- Colouring the Map
- Colonel Crackham asked his young son one morning to colour all the $26$ districts in this map
- in such a way that no two contiguous districts should be the same colour.
- The lad looked at it for a moment, and replied,
- "I haven't enough colours by one in my box."
- This was found to be correct.
- How many colours had he?
- He was not allowed to use black or white -- only colours.
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Sources
- 1932: Henry Ernest Dudeney: Puzzles and Curious Problems ... (previous) ... (next): Geometrical Problems: Various Geometrical Puzzles: $214$. -- Colouring the Map
- 1968: Henry Ernest Dudeney: 536 Puzzles & Curious Problems ... (previous) ... (next): Combinatorial & Topological Problems: Map Coloring Puzzles: $444$. Coloring the Map