Coding-Decoding Questions for ADRE Grade III 2027
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Coding-Decoding — Quick Overview
Letters/numbers are coded by a pattern. Find the rule and decode. 3-4 questions typical.
Key Formula
Letter position: A=1, B=2...Z=26 | Reverse: A=26, B=25... | Shift: each letter +2 or -3
Exam Tip
Write the alphabet with position numbers first. Check if it's a forward shift, backward shift, or reversal.
Common Trap
After Z comes A again (circular). If E is coded as H (+3), then W is coded as Z, X is A (not AA).