🎙 Concept / आधार
Coding–Decoding में एक शब्द/संख्या को किसी rule के अनुसार बदलकर लिखा जाता है।
Exam में हमें उस rule को पहचानकर नए शब्द का code खोजना होता है।
Major patterns:
- Letter shifting (+1, −1, +2 etc.)
- Position values (A=1, B=2 … Z=26)
- Opposite letters (A↔Z, B↔Y …)
- Word coding (replace, reverse, rearrange)
- Number coding (sum, product, square)
1️⃣ Letter Coding / अक्षर आधारित कोडिंग
Example: If CAT is coded as DBU, what is code for DOG?
C→D (+1), A→B (+1), T→U (+1)
Same rule:
D→E, O→P, G→H → EPH
Example: If FAN → EBM, what is PEN?
F→E (−1), A→B (+1), N→M (−1)
Use −1,+1,−1:
P→O, E→F, N→M → OFM
2️⃣ Word Coding / शब्द आधारित कोडिंग
Example: If TEACHER → TERCAHE, what is STUDENT?
Pattern: First 3 letters same, last 3 reversed.
STUDENT → STU + DNE → STUDNE
Example: If POLICE → ELICOP, what is DOCTOR?
Pattern: Reverse + shift.
DOCTOR → ROTCOD → ROTCOD
3️⃣ Number Coding / संख्या आधारित कोडिंग
Example: If HOT → 40, what is FUN?
H(8)+O(15)+T(20)=43 → −3 = 40
FUN: F(6)+U(21)+N(14)=41 → −3 = 38
Example: If DELHI → 38, find JAIPUR?
D(4)+E(5)+L(12)+H(8)+I(9)=38
J(10)+A(1)+I(9)+P(16)+U(21)+R(18)=75 → 75
4️⃣ Mixed Coding / मिश्रित कोडिंग
Example:
DOG → XTR
CAT → XPA
Find BAT?
Observe mapping:
D→X, O→T, G→R (predefined mapping set)
Similarly B→X, A→P, T→A → XPA
✔ Practice MCQs (Delhi Police Pattern)
- If SKY → TLZ, what is STAR?
Ans: TUBS
- If GUN → HTM, what is FIRE?
Ans: GJSF
- If BALL → CBMM, code for CALL?
Ans: DBMM
- If ROAD → QNB C, what is LOAD?
Ans: KNBC
- If CRIME → DSJNF, what is POLICE?
Ans: QPMJDF
- If CAT → 24, what is DOG?
Ans: 26
- If TREE → 56, what is LEAF?
Ans: 22
- If DELHI → 38, what is KOLKATA?
Ans: 68
- If MAP → N BQ, what is LAP?
Ans: M BQ
- If MANGO → NB OHP, what is GRAPE?
Ans: HSBQF
🔥 Challenge Question
If POLICE → QPMJDF, then CRIMINAL → ?
Shift +1 rule:
C→D, R→S, I→J, M→N, I→J, N→O, A→B, L→M
Answer: DSJNJOBM
Motivation: Coding–Decoding पूरा pattern game है।
Daily practice से 15–20 seconds में सवाल solve हो जाते हैं। 🚓🔥