📑 Topics on this page (Jump to Topic):
📌 1. Base: Letter Position Table
| Letter | Position | Opposite |
|---|---|---|
| A | 1 | Z (26) |
| E | 5 | V (22) |
| J | 10 | Q (17) |
| M | 13 | N (14) |
| O | 15 | L (12) |
| T | 20 | G (7) |
| Y | 25 | B (2) |
💡 Memory Tip: Opposite letter = 27 − position. Remember: AZ, BY, CX, DW, EV, FU, GT, HS, IR, JQ, KP, LO, MN.
📌 2. Types of Coding
| Type | Example |
|---|---|
| Letter shift (+n/−n) | CAT → DBU (+1) |
| Varying shift | BOOK → CQRO (+1,+2,+3,+4) |
| Opposite letters | GOLD → TLOW |
| Reversal | MANGO → OGNAM |
| Reverse + shift | BAD → DAB → EBC |
| Position sum | CAT = 3+1+20 = 24 |
| Letter → number | BED = 2 5 4 |
| Substitution | 'sky' is called 'sea'… |
⚠️ Exam Traps:
- In substitution, answer with the new name, not the real one. 'Sky is water, water is tree — where do fish live?' Answer = tree.
- Shifts are cyclic: Z + 1 = A.
📌 3. Sentence / Word Codes (Common-word method)
- A word common to two sentences has the code common to both.
- Example: 'tin pa lo' = 'I eat rice', 'pa ko mi' = 'they eat fruit' → 'pa' = eat.
- The order of codes usually does not follow the order of words.
📌 4. Number-based Coding
- Sum / product of positions / sum × number of letters.
- Reverse positions (Z=1): A=26.
- Digit-symbol codes: in conditional questions, check the conditions first.
📌 5. Practice MCQs
📝 Practice MCQs (prepared by SF Prep — not PYQs)
Q1. If CAT is written as DBU, how is DOG written? Practice
Correct answer: (B)
Each letter +1: D→E, O→P, G→H.
Each letter +1: D→E, O→P, G→H.
Q2. If BOOK is written as CQRO, how is LAMP written? Practice
Correct answer: (C)
Shifts +1, +2, +3, +4: L→M, A→C, M→P, P→T.
Shifts +1, +2, +3, +4: L→M, A→C, M→P, P→T.
Q3. If GOLD is written as TLOW, how is IRON written? Practice
Correct answer: (D)
Opposite letters: I→R, R→I, O→L, N→M.
Opposite letters: I→R, R→I, O→L, N→M.
Q4. If MANGO is written as OGNAM, how is APPLE written? Practice
Correct answer: (A)
The word is written in reverse.
The word is written in reverse.
Q5. If CAT = 24, then DOG = ? Practice
Correct answer: (B)
Sum of positions: C3+A1+T20 = 24; D4+O15+G7 = 26.
Sum of positions: C3+A1+T20 = 24; D4+O15+G7 = 26.
Q6. If BED = 254, then FACE = ? Practice
Correct answer: (C)
Each letter's position: F6, A1, C3, E5.
Each letter's position: F6, A1, C3, E5.
Q7. If ROSE is written as TQUG, how is LILY written? Practice
Correct answer: (D)
Each letter +2: L→N, I→K, L→N, Y→A (cyclic).
Each letter +2: L→N, I→K, L→N, Y→A (cyclic).
Q8. If 'sky' is called 'water', 'water' is called 'tree' and 'tree' is called 'road', where do fish live? Practice
Correct answer: (A)
Fish live in water, and water is called 'tree'.
Fish live in water, and water is called 'tree'.
Q9. 'tin pa lo' = 'I eat rice' and 'pa ko mi' = 'they eat fruit'. What is the code for 'eat'? Practice
Correct answer: (B)
'eat' and 'pa' are the only common items in both sentences.
'eat' and 'pa' are the only common items in both sentences.
Q10. If DELHI is written as CDKGH, how is MUMBAI written? Practice
Correct answer: (C)
Each letter −1: M→L, U→T, M→L, B→A, A→Z, I→H.
Each letter −1: M→L, U→T, M→L, B→A, A→Z, I→H.
Q11. If BAD is written as EBC (reverse, then +1), how is FEED written? Practice
Correct answer: (D)
Reverse of FEED is DEEF, then +1: EFFG.
Reverse of FEED is DEEF, then +1: EFFG.
Q12. If A = 26, B = 25 … Z = 1, then CAB = ? Practice
Correct answer: (A)
Reverse positions: C=24, A=26, B=25; sum = 75.
Reverse positions: C=24, A=26, B=25; sum = 75.
Q13. If PEN = 35 (sum of positions), then INK = ? Practice
Correct answer: (B)
P16+E5+N14 = 35; I9+N14+K11 = 34.
P16+E5+N14 = 35; I9+N14+K11 = 34.
Q14. If TEACHER is written as VGCEJGT, how is CHILD written? Practice
Correct answer: (C)
Each letter +2: C→E, H→J, I→K, L→N, D→F.
Each letter +2: C→E, H→J, I→K, L→N, D→F.
Q15. If ZEBRA is written as AVYIZ, how is HORSE written? Practice
Correct answer: (D)
Opposite letters: H→S, O→L, R→I, S→H, E→V.
Opposite letters: H→S, O→L, R→I, S→H, E→V.
Q16. If 'go home now' = 'ka pi ta' and 'come home soon' = 'ra pi su', what is the code for 'home'? Practice
Correct answer: (A)
The common word is 'home' and the common code is 'pi'.
The common word is 'home' and the common code is 'pi'.
Q17. If ACE = 135 and BDF = 246, then GIK = ? Practice
Correct answer: (B)
Letter positions: G7, I9, K11.
Letter positions: G7, I9, K11.
Q18. If WATER is written as XBUFS, how is FIRE written? Practice
Correct answer: (C)
Each letter +1: F→G, I→J, R→S, E→F.
Each letter +1: F→G, I→J, R→S, E→F.
Q19. If CAT = 3120 (positions written together), then BAG = ? Practice
Correct answer: (D)
B2, A1, G7 → 217.
B2, A1, G7 → 217.
Q20. If BIRD is written as YRIW, which word is written as XLDH? Practice
Correct answer: (A)
Apply the opposite-letter rule back: X→C, L→O, D→W, H→S.
Apply the opposite-letter rule back: X→C, L→O, D→W, H→S.