So touching
Joe has a special set of white counters numbered on one face 1, 2 or 3 and some of them have the other face coloured green. To test Penny鈥檚 logic skills, he placed 36 of his special counters on the table to form a 6 by 6 grid (see right). The number on the top face of a counter indicates the number of counters touching it that have a green lower face. Penny had to find which had green faces. Numbering the rows and columns from the top-left corner, in which columns are the green-faced counters in the third row?
WIN 拢15 will be awarded to the sender of the first correct answer opened on Wednesday 14 April. The Editor鈥檚 decision is final. Please send entries to Enigma 1586, New 杏吧原创, Lacon House, 84 Theobald鈥檚 Road, London WC1X 8NS, or to enigma@newscientist.com (please include your postal address).
Answer to 1580 If you knew what I knew: The numbers are 2, 3 and 4
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The winner Peter Hayes of Moreland, Victoria, Australia