1 General Mental and Psychological Abilities · 1.4.1 Mensuration and counting

1.4.1.2 Permutations, combinations and probability: basics

Permutation counts arrangements (order matters), combination counts selections (order does not), and probability is favourable outcomes ÷ total outcomes when all outcomes are equally likely.

  • APPSC Group 1
  • Advanced level
  • 7 min read
  • Full course

Key terms

  • counting principle
  • factorial
  • permutation
  • combination
  • arrangement of letters
  • circular arrangement
  • selection
  • committee
  • handshakes
  • probability
  • coins
  • dice
  • playing cards
  • complement

What this note covers

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

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