Y by Mango247
Georg has
cards with one number written on each card. On one card the integer
is written, and among the rest of the cards, the integers
appear, each twice. Georg wants to place the cards in a row in such a way that the
-card is in the middle, and for each
, the two cards with the number
have the distance
(meaning that there are exactly
cards between them).
For which
is this possible?








For which
