One three-digit number
Author: admin
Problem has been solved: 264 times
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Find the sum of all positive integer numbers $n$, such that among numbers $n$ and $n+20$ there is exactly one has three digits.
Найдите сумму всех натуральных чисел $n$, что среди чисел $n$ и $n+20$ ровно одно является трехзначным.
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