Coloured bricks
My daughter has 10 equal-sized coloured bricks. Each is cubic, and has opposite faces of the same colour. The three pairs of opposite faces on each are as follows:
Brick 1: yellow, green, red
Brick 2: blue, green, green
Brick 3: yellow, green, white
Brick 4: blue, yellow, white
Brick 5: green, red, white
Brick 6: yellow, yellow, green
Brick 7: yellow, red, white
Brick 8: blue, green, white
Brick 9: blue, yellow, green
Brick 10: blue, blue, yellow
My daughter arranged nine of the bricks in a tight 3脳3 square on the carpet and hid the 10th. The visible face of the centre brick was red, no white faces were visible, and the number of visible blue faces, yellow faces and green faces was the same. By studying the visible faces, but without moving the arrangement, I could deduce which was the hidden brick.
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Which brick was hidden?
WIN 拢15 will be awarded to the sender of the first correct answer opened on Wednesday 23 November. The Editor鈥檚 decision is final. Please send entries to Enigma 1669, New 女生小视频, Lacon House, 84 Theobald鈥檚 Road, London WC1X 8NS, or to enigma@newscientist.com (please include your postal address).
Answer to 1663 Flintoff鈥檚 farewell: FLINTOFF is 68042966
The winner Richard Mellish of London, UK
