Prelims · 8 Mental Ability · 8.2 Algebra: equations, identities and progressions

8.2.5 Arithmetic and geometric progressions: nth term and sums

An AP adds the same number each step and a GP multiplies by the same number; two formulas each (nth term and sum) answer almost every progression question.

  • APPSC Group 2 · Prelims
  • Standard level
  • 6 min read
  • Full course

Key terms

  • arithmetic progression
  • geometric progression
  • nth term
  • sum of n terms
  • infinite GP
  • arithmetic mean
  • geometric mean
  • sum of squares
  • sum of cubes
  • telescoping series

What this note covers

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

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