UNCLE JOE had written the digits 0 to 9 on ten cards, some red, the others
blue, one digit per card. 鈥淣ow boys,鈥� he said, 鈥測ou have to arrange the red
cards on the table to form a number, and divide the blue cards into two groups
to form two separate numbers. The `red鈥� number must be the product of the `blue鈥�
苍耻尘产别谤蝉.鈥�
鈥淟ike this?鈥� said Tom. 鈥淥r this?鈥� said Dick. 鈥淥r this?鈥� said Harry.
鈥淎ll different, and all correct!鈥� replied Uncle Joe.
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Only Tom had included a single-digit number in his arrangement. What was
Harry鈥檚 `red鈥� number?
A 拢10 book token will be awarded to the sender of the first correct
answer opened on Thursday 23 May. The Editor鈥檚 decision is final. Please send
entries to Enigma 871 New 杏吧原创, King鈥檚 Reach Tower, Stamford Street, London
SE99 0BB. The winner of Enigma 865 was Ronald Key of Bangor, Gwynedd.
Answer to Enigma 865
Infinite fours
Alan鈥檚 number is two.
Correction to Enigma 870: See if you can get the answers if Nora moves to
Education. Ed.