Coding, Decoding & Letter Series

Alphabet coding requires instantaneous recall of letter ranks (A=1 ... Z=26) and opposite pairs (A-Z, B-Y, C-X, D-W, E-V, F-U, G-T, H-S, I-R, J-Q, K-P, L-O, M-N). The sum of ranks of any opposite pair is always 27.

Exam Frequency: 3 to 5 questions in Infosys, Wipro, Accenture, and SSC

Essential Formulas & Shortcut Rules

EJOTY Rule: E=5, J=10, O=15, T=20, Y=25

Reference anchors for rapid letter rank navigation.

Reverse Rank = 27 - Forward Rank

Converting forward position to backward position.

Worked Step-by-Step Examples

Example 1: In a certain code, "CLOUD" is written as "ENQWF". How will "STORM" be encoded in that system?

Step-by-Step Mathematical Derivation:

•Analyze CLOUD -> ENQWF:

•C (3) -> E (5) (+2)

•L (12) -> N (14) (+2)

•O (15) -> Q (17) (+2)

•U (21) -> W (23) (+2)

•D (4) -> F (6) (+2)

•The cipher adds +2 to each letter position.

•Apply to STORM: S(19)+2 = U(21); T(20)+2 = V(22); O(15)+2 = Q(17); R(18)+2 = T(20); M(13)+2 = O(15).

•Result: UVQTO.

Answer: UVQTO

💡 Speed Shortcut: Check the first and last letters first to eliminate distractors within 5 seconds.

Common Exam Traps to Avoid

✕Overlooking reverse wrapping: Z + 1 = A, A - 1 = Z.
✕Misidentifying cross-transpositions as irregular letter shifts.

Interactive Practice Drill (2 Questions)

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Coding, Decoding & Letter Series Practice Drill

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1Coding, Decoding & Letter Series

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In a certain code language, "TARGET" is coded as "VCTIGV". How will "STREAM" be written in that code language?

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