Выпавший кусок книги

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Сложность: 

Из книги выпал кусок, первая страница которого имеет номер 328, а номер последней записывается теми же цифрами, но в каком-то другом порядке. Сколько страниц в выпавшем куске?

Решение

Поскольку последняя страница должна иметь номер другой, нежели начальная, чётности, но её номер 823. А всего в выпавшем куске 823 – 328 + 1 = 496 страниц.




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