Question

In a certain code language, each letter is assigned a unique digit. Based on the following codes: PLANE is coded as 74851 and DOG as 392, how is GOLD coded?

• A. 2843
• B. 2943
• C. 2394
• D. 2934

Answer 1

Answer:

B. 2943

Methodology for Solving Substitution Coding

• Analyze Given Data: The problem provides direct substitution mappings for letters to digits. By observing the given sets, we can extract the specific value assigned to each letter:
• From PLANE = 74851: P=7, L=4, A=8, N=5, E=1
• From DOG = 392: D=3, O=9, G=2
• Identify Target Word: The task requires decoding the word GOLD. We map the letters of the target word using the extracted values:
• G = 2
• O = 9
• L = 4
• D = 3
• Construct the Result: Combining these values sequentially (G-O-L-D) results in 2943.

Key Strategy for Competitive Exams

• Direct Matching: Always look for direct substitution patterns first. In many competitive exams (like Kerala PSC), these types of coding-decoding questions rely on fixed letter-to-digit mappings rather than complex mathematical operations.
• Verification: Always re-verify the mapping sequence. For example, ensure 'L' from PLANE and 'D' from DOG are correctly identified before forming the final code.