Memory
In an 4 by 4 grid 16 cards
are placed. 8 different cards, each occurring twice. Same cards are never
placed in the same row, column or diagonal. The numbers around the grid tell you
how many A's (top), B's (middle) and C's (bottom number) you can see in
that row, column or diagonal. One card is already given. How are the 16
cards placed??
