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Non-arithmetic Triplets (Posted on 2013-04-08) Difficulty: 3 of 5
Find nine different integers from 1 to 20 inclusive such that no combination of any three of the nine integers form an arithmetic sequence.

(For example, if two of the integers chosen were 7 and 13, then that would preclude 1, 10 and 19 from being included.)

No Solution Yet Submitted by K Sengupta    
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  Subject Author Date
re(2): Counting UpBryan2013-04-09 10:37:33
Hints/Tipsre(5): Counting Up,,,,Why not up and down?Ady TZIDON2013-04-09 09:35:44
re(4): Counting Up,,,,Why not up and down?Charlie2013-04-09 01:52:20
Hints/Tipsre(3): Counting Up,,,,Why not up and down?Ady TZIDON2013-04-09 01:20:20
re(3): Counting UpJer2013-04-09 00:46:52
re(2): Counting UpCharlie2013-04-08 19:56:32
Solutioncomputer solution--includes the symmetric oppositeCharlie2013-04-08 16:03:25
Some Thoughtsre: Counting UpJer2013-04-08 16:01:02
Hints/TipsCounting UpBryan2013-04-08 14:53:28
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