Part 1 on Aptitude test questions. This video deals with sequence and series. This video gives you an introduction to Arithmetic and geometric series along with ideas on obtaining their sum.

Progressions
Arithmetic progression (AP)
Geometric progression (GP)

Examples of AP

  1. 1, 2, 3, 4, 5, 6, … … … …
  2. 3, 5, 7, 9, 11, 13,… … …
  3. 5, 10, 15, 20, 25, 30, … … …
  4. 70, 65, 60, 55, 50, … … …

Examples of GP

  1. 1, 3, 9, 27, … … …
  2. 1, 2, 4, 8, 16, 32, … … …
  3. 27, 9, 3, 1, … … …
  4. 1, 5, 25, 125, … … …