First half forward, second half back — Aptitude Question
First half forward, second half back: If BOARD is coded as CPBSE, how is CHAIR coded? Answer and worked solution on CodeKairo.
- Topic: Coding & Decoding
- Section: Logical Reasoning
- Difficulty: Easy
- Time target: 50 seconds
Question
If BOARD is coded as CPBSE, how is CHAIR coded?
Options
- DIBJS
- DIBJT
- DHBJS
- EIBJS
Show the answer and the worked solution
Correct answer: A. DIBJS
Worked solution
- The shift is +1 throughout.
- C→D, H→I, A→B, I→J, R→S.
- The code is DIBJS.
Answer: DIBJS.
The idea
Verify the shift on every letter of the example, not just the first two. A word where the shift changes midway would look identical at the start.
Shortcut. The options differ at C (D or E), H (I or H) and R (S or T). A +1 shift gives D, I and S, so DIBJS is the only fit.
Common trap. "DHBJS" — leaving H unchanged, a skipped letter in a run of +1 shifts; H + 1 = I.