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?
(In reply to trying to do better
by Ady TZIDON)
That list doesn't begin and end with the same digit, and so doesn't form a ring.
Posted by Charlie
on 2008-01-10 00:08:18