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Solution to Enigma No. 1535

4 March 2009

New Scientist. Science news and long reads from expert journalists, covering developments in science, technology, health and the environment on the website and the magazine.

Read the original question

Answer: The lower 6-digit number is 109,989

The winner is Robert Crowe of Wallingford, Oxfordshire, UK. There were 184 entries.

Worked answer

See diagram for a full explanation.

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