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Double pandigital number divisible by 11

Problem 491

Published on 30 November 2014 at 10:00 am [Server Time]

We call a positive integer double pandigital if it uses all the digits 0 to 9 exactly twice (with no leading zero). For example, 40561817703823564929 is one such number.

How many double pandigital numbers are divisible by 11?


Answer not yet available
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