Question 29 of 48 · Coding-Decoding
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NIMCET 2010

If UNDERSTAND is coded as 1234567823, how will START be coded?

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Answer: Option D — 67857

Detailed Solution

1

Matching letters to digits: U = 1, N = 2, D = 3, E = 4, R = 5, S = 6, T = 7, A = 8 (the final N, D repeat 2, 3).

2

START = S, T, A, R, T = 6, 7, 8, 5, 7, i.e. 67857.

✓ Check

T appears twice in START, and 7 appears in the 2nd and 5th places of 67857.

⚠ Common trap

(A) 56781 codes the letters R, S, T, A, U, one place too early in UNDERSTAND.

Quick tip

Read each letter's digit from its place in UNDERSTAND.

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Coding-Decoding — Preparation

This question tests your understanding of Coding-Decoding, a key topic in the Logical Reasoning section. The detailed solution above uses a step-by-step approach to show the reasoning, and where available, a shortcut that helps you solve similar questions in under 90 seconds during the actual exam.

Coding-decoding questions give a word, number or sentence written in a secret code and ask you to work out the rule, then apply it to a new word. This topic covers letter coding (shifting letters forward or backward), number coding, substitution coding, mixed letter-number-symbol coding, and sentence or word-group coding. The key skill is spotting the pattern quickly. Memorising the position of each letter in the alphabet (A = 1 to Z = 26) and its reverse position (A = 26 to Z = 1) speeds up most letter-shift questions. For sentence coding, compare two sentences that share a word to find which code belongs to it. Check your rule against every letter before using it, since many questions use different shifts for alternate letters. Practise the coding-decoding questions below, each with a step-by-step solution showing how the pattern is found.