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Question

In a particular code language where CHAIR is written as DIBJS, TABLE is written as UBCMF, and WINDOW is written as XJOEPX, then using this systematic encoding method, how would KEYBOARD be written?

This question was previously asked in
SSC CHSL 2025 Tier 1 Question Paper (21-Nov-2025) (Shift 1)
The correct answer is

LFZCPBSE

This is a letter-shifting code, so first find the constant shift by comparing each plaintext letter with its coded letter.

In CHAIR → DIBJS: C→D, H→I, A→B, I→J, R→S. Every letter moves exactly one place forward in the alphabet, a shift of +1.

The same rule holds for the other examples: TABLE → UBCMF and WINDOW → XJOEPX, each letter again advancing by one. This confirms the encoding is a uniform +1 shift.

Now apply +1 to every letter of KEYBOARD, taking each letter to its immediate successor.

K→L, E→F, Y→Z, B→C, O→P, A→B, R→S, D→E, which spells out LFZCPBSE.

The key idea is a fixed alphabetical shift: once the +1 rule is verified on the given words, it is applied letter by letter to the target word.

Therefore, KEYBOARD is written as LFZCPBSE.

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Important Questions from Coding and Decoding By Letter Shifting

  1. In a certain code language, BEAT is written as YVZG. What will be the code of MILD?
  2. If BE QUICK is coded as ZC OSGAI, then the code of the last letter of the third word in the sentence I LOVE MY COUNTRY is
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