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ID: past-exam-of-the-mathematics-course-of-the-university-of-cambridge/2024/ia/paper-4/5e/i/solution

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Past exam of the mathematics course of the University of Cambridge / 2024 / ia / Paper 4 / 5E / i / Solution by Codex 0 Created 2026-09-24 Updated 2026-09-25
A decimal integer is congruent modulo to its digit sum. Cyclic permutation does not change that sum. Hence every rotation of a multiple of is again divisible by .
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