Question
`19` apple trees are arranged in a circle. Prove that there exists a pair of adjacent trees such that the total number of apples on them is even.
Difficulty level (1 very easy - 10 very hard): 1
Topics:
Logic
->
Reasoning / Logic
Number Theory
->
Division
->
Parity (Even/Odd)
Proof and Example
->
Proof by Contradiction
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