P491
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Double Pandigital Number Divisible by $11$

ℹ️Published on Sunday, 30th November 2014, 10:00 am; Solved by 2368;
Difficulty rating: 20%

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 $11$?



Soluzione

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