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by Brian Gladman on January 13, 2013

Sunday Times Teaser 2625 – Mind the Gap

by Nick MacKinnon

If all ten digit numbers with no repeated digits are listed in increasing order, the first is 1023456789 and the last is 9876543210.

The difference between consecutive numbers in this list is never equal to the average of all such differences.

What is the value of the difference that is closest to their average?

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