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

9.7.2 Number, substitution and sentence (word-to-code) coding

Number codes turn letters into values (positions, sums, products), substitution codes rename objects, and sentence codes hide each word behind a code word that you isolate by comparing sentences that share words.

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

Key terms

  • number coding
  • position values
  • sum of letters
  • product of letters
  • reverse values
  • letter-digit table
  • substitution coding
  • sentence coding
  • common words method
  • digit sentence codes
  • conditional coding
  • digit coding
  • odd and even places

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.