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BANKERS TUTORIAL · IBPS & RRB · TOPIC & REVISION GUIDE

Topic guide: Coding-decoding: recover mappings without overclaiming

Coding-decoding problems ask learners to identify substitutions, ordering rules or symbol relationships from stated evidence. A sound mapping must explain shared and differing elements without assuming an arbitrary language or hidden convention.

01 / 03Learn with a clear direction

3 min read Original learning material · Prepared 14 Oct 2026

This is an independent topic guide, not the official syllabus. Compare it with the current paper outline and rules published by the examination authority.

01 / UNDERSTANDING

Learning objectives

Cover intersections, one-to-one substitutions and letter-position transformations, while learning to recognise when a code cannot be uniquely determined. Keep sentence intersections separate from alphabetical or positional letter transformations. Your practical tasks are to list the shared words and shared codes for each pair and separate confirmed mappings from unresolved alternatives in the table. These conceptual objectives are a study framework, not an official question allocation. Demonstrate the distinction with a fresh worked case, including the assumptions that make the answer valid.

02 / UNDERSTANDING

The concept in context

Coding-decoding problems ask learners to identify substitutions, ordering rules or symbol relationships from stated evidence. A sound mapping must explain shared and differing elements without assuming an arbitrary language or hidden convention. Compare overlapping statements, isolate their intersections and record unresolved pairings. Letter-position rules require checking every character rather than matching only the first letter.

03 / UNDERSTANDING

A worked learning case

In an original code, "save money daily" is "ka tu mi" and "save time daily" is "ka lo mi". A third statement, "daily practice helps", is "mi sa re". The first two statements leave save and daily unresolved between ka and mi. The third isolates daily as mi, so save must be ka.

ORIGINAL EDUCATIONAL PRACTICE

Try it before you check.

Which code represents money in the stated example?

Show the answer and reasoning

tu.

The first and second statements share save and daily, represented by ka and mi in some order. Money appears only in the first of those statements, so its unmatched code is tu. The third statement resolves daily separately but is unnecessary for identifying the word money.

Two traps to watch for.

  • Assigning each word to the code in the same displayed position.
  • Treating an unresolved pair of codes as a unique mapping.

YOUR TOPIC-SPECIFIC LEARNING MAP

Your revision map

  1. List the shared words and shared codes for each pair.

  2. Separate confirmed mappings from unresolved alternatives in the table.

  3. Test the mapping against a statement not used initially.

Explain the idea, apply it to a new situation, then check what changed in your reasoning.

BANKERS TUTORIAL · SOURCE NOTES

Keep the source alongside your notes.

Official links provide subject context and authoritative reference material. This guide’s explanation, scenario and question are original Bankers Tutorial learning content.

  1. www.ibps.in https://www.ibps.in/wp-content/uploads/Detailed-Notification_CRP-PO-XIV_7.8.24.pdf

For IBPS & RRB preparation, check the current official notice before relying on changing dates, rules or examination requirements.

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