Question
The magical land consists of `25` provinces. Is it possible that each province borders an odd number of other provinces?
Difficulty level (1 very easy - 10 very hard): 4
Topics:
Combinatorics
->
Double Counting
Combinatorics
->
Graph Theory
Number Theory
->
Division
->
Parity (Even/Odd)
Proof and Example
->
Proof by Contradiction
Combinatorics
->
Colorings
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