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| Increasing sequences (Posted on 2015-11-30) |
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List all the 3X3 arrays of nine distinct positive digits such that each of the rows and each of the columns is an increasing sequence.
Example: 1,2,5; 3,4,7; 6,8,9.
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Submitted by Ady TZIDON
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Solution:
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There are 21 solutions starting 12 in the first row,and 21 their diagonal inversions starting 13.
Full list of 42 solutions see Charlie's post.
Analytical expose, how this number was reached, see Jer's. |
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