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PROJECT EULER · #0491

Double Pandigital Number Divisible by 11

Statement only · SolvedOriginal problem ↗

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?

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