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Triangular Ring (Posted on 2008-01-09) Difficulty: 3 of 5
Each of the triangular numbers that are below 1000 is written on a separate card. Some of these cards are then placed in a circle so that, viewed from the center, the right-hand digit of each card matches the left-hand digit of the card to its right. No tricks are used such as turning a card upside-down.

What's the maximum number of digits that can appear on such a subset of the cards?

See The Solution Submitted by Charlie    
Rating: 2.6667 (3 votes)

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No Subject | Comment 7 of 9 |
Oh! Oh!  This wording is very significant, "the right-hand digit of each card matches the left-hand digit"!

And I see Dej Mar has taken this into account in his explanation.

Edited on January 12, 2008, 2:02 am
  Posted by brianjn on 2008-01-12 01:58:25

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