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If 'NICK' is coded as 'MJBL' (each letter shifted: N→M, I→J, C→B, K→L — alternating ±1), then 'JOHN' is coded as:
AIPGO
BINGM
CKPGO
DIPHO
Answer & Solution
Correct answer: A. IPGO
1. Alternating −1/+1 from NICK: position 1 (−1), pos 2 (+1), pos 3 (−1), pos 4 (+1).
2. JOHN: J→I (−1), O→P (+1), H→G (−1), N→O (+1).
3. = IPGO.
_Source: jkchrome Coding-Decoding, p.7 — alternating shift_
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