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1995th 7-digit number (II Soros Olympiad 1995-96 R1 11.5)

Source:

June 3, 2024
number theoryDigits

Problem Statement

Let's consider all possible natural seven-digit numbers, in the decimal notation of which the numbers 11, 22, 33, 44, 55, 66, 77 are used once each. Let's number these numbers in ascending order. What number will be the 1995th1995th ?
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