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Nonarithmetic Triplets (Posted on 20130408) 

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.)
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Subject 
Author 
Date 
 re(2): Counting Up  Bryan  20130409 10:37:33 
 re(5): Counting Up,,,,Why not up and down?  Ady TZIDON  20130409 09:35:44 
 re(4): Counting Up,,,,Why not up and down?  Charlie  20130409 01:52:20 
 re(3): Counting Up,,,,Why not up and down?  Ady TZIDON  20130409 01:20:20 
 re(3): Counting Up  Jer  20130409 00:46:52 
 re(2): Counting Up  Charlie  20130408 19:56:32 
 computer solutionincludes the symmetric opposite  Charlie  20130408 16:03:25 
 re: Counting Up  Jer  20130408 16:01:02 
 Counting Up  Bryan  20130408 14:53:28 


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