Paper I · 9 Logical Reasoning & Analytical Ability · 9.7 Coding–decoding

9.7.5 Matrix and grid codes: row–column letter codes

In a grid code each letter is named by where it sits (row, then column, unless the question says otherwise), so build or copy the grid, read off two numbers per letter, and check every pair of an option, not just the first.

  • APPSC Paper I · Paper I
  • Standard level
  • 7 min read
  • Full course

Key terms

  • matrix coding
  • grid code
  • row and column
  • 5 x 5 letter grid
  • two matrices
  • 0 to 9 matrix
  • column-wise grid
  • Polybius square
  • move codes
  • phone keypad code
  • decoding a grid code
  • row-column order

What this note covers

  1. Core factsFoundation
  2. ExplainedStandard
  3. DeeperAdvanced
  4. Common trapsFoundation
  5. Quick revisionFoundation

Read the full note in the app. It is part of the APPSC Paper I full course in Medha AI. Free in the app: the first chapter of each topic.

Read the full note in the app Logical Reasoning & Analytical Ability questions with answers

All Coding–decoding notes · APPSC Paper I syllabus · APPSC Paper I Mock 1 with answers · Start free

Medha AI writes its own notes and checks them against the sources listed. Medha AI is an independent preparation service. It is not affiliated with, endorsed by or connected to APPSC, TSPSC, MPSC, UPSC or any other commission or government body.