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True for nine and up (Posted on 2017-03-24) Difficulty: 3 of 5
If a set N9 = {1, 2, 3, 4, 5, 6, 7, 8, 9} of 9 numbers is split into two subsets, then at least one of them contains three terms in arithmetic progression.
The statement is not true for a set N8 of 8 integers.

Seems obvious?

Prove it.

No Solution Yet Submitted by Ady TZIDON    
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  Subject Author Date
Hints/Tipsre: By handAdy TZIDON2017-03-25 05:55:41
SolutionBy handJer2017-03-24 12:39:01
SolutionWith some computer aidCharlie2017-03-24 11:00:45
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