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Encoding rule: each digit replaced by its successor (1→2, 9→0). Encode '15847'.
A26958
B26948
C06948
D26947
Answer & Solution
Correct answer: A. 26958
1. 1→2, 5→6, 8→9, 4→5, 7→8.
2. Concatenate: 2-6-9-5-8.
3. = 26958.
_Source: jkchrome Coding-Decoding, p.6 — digit-shift cipher_
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